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Follow clues, question assumptions, and notice the details others might miss.
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Stories experienced together
You are not outside the story.
Enter mysteries, adventures, and impossible worlds as the protagonist's second mind. Notice what matters. Question what does not fit. Decide what we do next.
Two perspectives.One shared experience.
The heart of Tandem Tales
The reader is the partner.
You do not simply choose what happens. You choose what matters - and that shapes how the story is understood.
Think together
Work alongside the protagonist as an active partner inside the narrative.
Live the outcome
Experience consequences earned through interpretation, judgment, and timing.
Hot off the press
Latest News
The Cold Night Parade Case Kindle Edition in Preparation
The Kindle eBook edition of The Cold Night Parade Case — Standard Edition, Ages 11+ is now being prepared for publication through Amazon KDP. The digital edition will preserve the branching-path structure while adding direct internal navigation to help readers move easily between choices, chapters, and subchapters. The paperback edition is already available on Amazon, with the Kindle edition coming soon.
The Vanishing Tower Comes to Kindle
Tandem Tales is expanding its digital library with The Vanishing Tower: Apprentice Edition for Kindle. The eBook brings the interactive Tandem Tales experience to digital readers with internally linked choices designed to make navigating the adventure easy. The Kindle edition is priced at $6.99.
The Space Diamond Heist Arrives November 1
A new Tandem Tales Master Edition adventure is on the way. The Space Diamond Heist is scheduled for release on November 1, 2026. The story takes readers into a high-stakes mystery involving valuable cargo, luxury vessels, deception, and choices that can change the direction of the investigation. More release information will be added as publication approaches.
Available now
Choose your next experience.
Investigations - Standard Edition · Ages 11+
The Cold Night Parade Case
In San Antonio, Texas, its famous night parade ends in tragedy—and the case is ruled an accident before the most important questions can be asked.
Decades later, the investigation is reopened. Private investigator Nash Castle must follow what little remains: fractured evidence, fading memories, and a truth that has never fully settled. As he retraces the events surrounding the parade, every witness remembers something different, and every new lead challenges what everyone has believed for years.
Someone has waited a long time for the truth to remain buried. With time running out, Nash must solve the case before his chance disappears—and finding the truth may prove more dangerous than he expects.
At key points, you will choose which leads Nash follows and where the investigation takes him, shaping what he uncovers and how the case ends.
Help Nash make the right choices and uncover the truth behind The Cold Night Parade Case.
Practice these skills
Observation →Questioning →Understanding Information →Analyzing Information →Evaluating Information →Evidence-Based Reasoning →Making Inferences →Recognizing Assumptions →Recognizing Bias →Considering Different Perspectives →Recognizing Patterns →Problem Solving →Decision Making →Considering Consequences →Self-Reflection & Revising Thinking →
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Early Edition · Ages 4+
Lost in the Grocery Store
Mercy gets separated from her mom in a crowded grocery store. Help her stay calm, notice what matters, and make choices that can lead her safely back to her family.
Practice these skills
Observation →Understanding Information →Analyzing Information →Evaluating Information →Evidence-Based Reasoning →Making Inferences →Problem Solving →Decision Making →Considering Consequences →Self-Reflection & Revising Thinking →
FREE PDFRead or leave a review →Read Free
Apprentice Edition · Ages 8+
Busted Wheels
A string of bicycle thefts is spreading across San Antonio. Work beside Nash Castle and Mercy as they study the patterns, question the evidence, and decide which leads deserve a closer look.
Practice these skills
Observation →Questioning →Understanding Information →Analyzing Information →Evaluating Information →Evidence-Based Reasoning →Making Inferences →Recognizing Assumptions →Recognizing Bias →Recognizing Patterns →Problem Solving →Decision Making →Considering Consequences →Self-Reflection & Revising Thinking →
FREE PDFRead or leave a review →Read Free
Standard Edition · Ages 11+
Hit or Miss
A routine stop in Seguin becomes a fight for survival when an armed stranger takes control of Nash Castle’s vehicle. With every move carrying a risk, Nash must read the situation, weigh his chances, and decide when to act.
Practice these skills
Observation →Questioning →Understanding Information →Analyzing Information →Evaluating Information →Evidence-Based Reasoning →Making Inferences →Recognizing Assumptions →Recognizing Bias →Considering Different Perspectives →Recognizing Patterns →Problem Solving →Decision Making →Considering Consequences →Self-Reflection & Revising Thinking →
FREE PDF
Fantasy Connections - Master Edition · Ages 14+
Dragon Love Triangle
Livestock is disappearing across the Kingdom of Highwall, and a dragon is blamed. Join Princess Nerissa and dragon scholar Lucius as they follow the evidence, question what people assume, and decide what the kingdom should do next.
Read or leave a review →Read Free
Apprentice Edition · Ages 8+
The Vanishing Tower
Same story. Choose your favorite cover.
Nash Castle spends his days maintaining San Antonio's Tower of the Americas and his nights moonlighting as a bartender inside the tower.
When a valuable painting mysteriously vanishes from the top of the landmark, Nash finds himself drawn into a case hidden within the place he knows best. There are no obvious signs of how it was taken, and every new discovery raises another question.
To recover the painting, Nash must look beyond familiar surroundings and determine what everyone else has overlooked.
At key points, you will choose the direction Nash takes, navigating the investigation and shaping how the story unfolds.
Help Nash make the right choices and recover the painting in The Vanishing Tower.
Practice these skills
Observation →Questioning →Understanding Information →Analyzing Information →Evaluating Information →Evidence-Based Reasoning →Making Inferences →Recognizing Assumptions →Considering Different Perspectives →Recognizing Patterns →Problem Solving →Decision Making →Considering Consequences →Self-Reflection & Revising Thinking →
Early Edition
Lost - Volume 1
Dad cannot find his keys, and a trip to the grocery store brings an entirely different kind of lost moment. Ricky and Mercy must slow down, search their surroundings, and separate useful clues from quick assumptions. Young readers help them choose what to try next in two relatable family adventures.
Practice these skills
Observation →Questioning →Understanding Information →Analyzing Information →Evaluating Information →Evidence-Based Reasoning →Making Inferences →Recognizing Assumptions →Problem Solving →Decision Making →Considering Consequences →Self-Reflection & Revising Thinking →
Early Edition
Lost - Volume 2
Bruno has disappeared, and a missing kitty needs help finding the way home. Ricky and Mercy search familiar places, follow small clues, and discover that the first answer is not always the right one. Young readers join the search and help decide the smartest next step.
Practice these skills
Observation →Questioning →Understanding Information →Analyzing Information →Evaluating Information →Evidence-Based Reasoning →Making Inferences →Recognizing Assumptions →Recognizing Patterns →Problem Solving →Decision Making →Considering Consequences →Self-Reflection & Revising Thinking →
Early Edition - Volumes 1 & 2
Lost - Complete Collection
Four everyday mysteries bring together lost keys, a confusing grocery-store moment, a missing Bruno, and a kitty that needs to get home. Ricky and Mercy face each problem with curiosity, patience, and teamwork. Readers help guide the search, then continue the fun with family activities and discussion pages.
Practice these skills
Observation →Questioning →Understanding Information →Analyzing Information →Evaluating Information →Evidence-Based Reasoning →Making Inferences →Recognizing Assumptions →Recognizing Patterns →Problem Solving →Decision Making →Considering Consequences →Self-Reflection & Revising Thinking →
Coloring Activity Adventure Book
Summer with Grandpa Castle
School is out, Grandpa Castle has the map, and a whole summer of pools, parks, beaches, bike rides, and unexpected discoveries lies ahead. Every new stop turns into part of the family adventure. Coloring pages and activities let young explorers bring the journey to life in their own way.
Read or leave a review →Buy on AmazonA challenge for every reader
Four editions. More ways into the story.
Each edition changes the guidance, complexity, and weight of the reader's judgment.
Age 4+
Gentle, guided adventures that introduce observation, questions, and thoughtful choices.
Age 4+
An Early Edition subedition with coloring and activity adventures that encourage creativity, observation, and discovery.
Age 8+
Clear signals and guided challenges that teach readers how to think through a story.
Age 11+
More complex signals, meaningful consequences, and greater weight placed on interpretation.
Age 14+
The full challenge: conflicting signals, branching realities, and outcomes earned through judgment.
Watch the clues. Find the answer.
A mystery begins Monday. The answer arrives Friday.
Watch the question, study the clues, and decide what happened. Then return Friday to see if your answer fits the story.
Who Ate Dad's Taco?
Monday question
Watch the question Friday answer
Watch the answer Who Shredded My Book Report?
Monday question
Watch the question Friday answer
Watch the answer Who Opened My Backpack?
Monday question
Watch the question Friday answer
Watch the answer Who Took Mom's Garden Glove?
Monday question
Watch the question Friday answer
Watch the answer What Is Not in the Right Place?
Monday question
Watch the question Friday answer
Watch the answer Coming soon
New worlds. New questions.
Tandem Tales crosses genres while preserving the same promise: the story needs your perspective.
Action - Master Edition
The Space Diamond Heist
The Space Diamond is unlike anything ever found on Earth—and it is about to be sold to the highest bidder.
Hidden aboard a massive cargo vessel, the diamond is the centerpiece of a secret black-market auction. It is protected by armed security, advanced technology, and some of the world's wealthiest—and possibly most dangerous—buyers.
Nash Castle and his team must navigate the auction, study its defenses, and find an opportunity to recover the diamond before it disappears into a private collection. But the deeper they investigate, the more they realize the Space Diamond may not be the only secret hidden aboard the vessel.
At key points, you will choose what the team focuses on and which direction the heist takes, shaping their plan and the dangers they face.
Help Nash Castle and his team make the right choices, uncover the vessel's secrets, and pull off The Space Diamond Heist.
Full introduction coming soonPractice these skills
Observation →Questioning →Understanding Information →Analyzing Information →Evaluating Information →Evidence-Based Reasoning →Making Inferences →Recognizing Assumptions →Considering Different Perspectives →Recognizing Patterns →Problem Solving →Decision Making →Considering Consequences →Self-Reflection & Revising Thinking →T
Our mission
Building thoughtful, adaptable, and resilient readers.
The mission of Tandem Tales is to help children grow into thoughtful, adaptable, and resilient adults by developing the critical-thinking, problem-solving, and self-learning skills needed to confidently navigate an increasingly complex and ever-changing world.
We encourage readers to think independently, question responsibly, evaluate information carefully, and use technology as a powerful tool rather than accept it as unquestionable truth.
About the creator
Marcos Ignacio Castillo
Marcos Ignacio Castillo is a writer, author, and creative director behind Digital Castle Works, a personal creative incubator focused on storytelling, media, and interactive systems.
With over 30 years of experience in technical systems, productivity development, and problem-solving, Marcos blends structured thinking with creative expression to explore how identity is shaped through personal experience and cultural influence.
He is the creator of Tandem Tales, an interactive storytelling system that places the reader inside the narrative as a decision-making partner.
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