Shannon Gilligan

Someone wants your detective agency to investigate the disappearance of the an American businessman who might be living as a Buddhist monk in Thailand. You are promised a huge reward. You decide what to do next

The reader's parents have gone on vacation, and the reader is invited by Uncle Gilroy, the famous archaeologist, to an Australian expedition to uncover an ancient civilization. But when terrorists begin mining nearby uranium, the reader must stop them before they have enough for nuclear weapons.

Original publication. Later rebranded as "The Lake Monster Mystery"

The sun is shining and the lake is calm. Your second summer on Princess Island is finally here! You will be bunking with your best friend from last summer, Princess Caroline of Ludmilia. The two of you plan to look for the ghost of Violet Grimm, compete for the archery medal, and try to place fifth or better in the Cabin Cup. That is until you find a threatening note under your pillow on your first night away. Someone with the initials "GT" has threatened you and your cabin with "payback." Is the fun over before camp even begins?

Holding an amulet as his proof of the ancient civilization of Satyrion, your Uncle Gilroy offers you the opportunity of a lifetime. But the path to success quickly gets trampled as traitors and crime syndicates search for their own prize -- uranium! With your life at risk, your uncle missing, and no one to trust, you realize it's up to you to make the right choice in order to survive.

A note from Kyle, an older brother who's a reporter for the city newspaper, says that he's out investigating a hot lead on a story, and if he's not back by six o'clock, then the police must be called. It's just past six, and readers have to decide what to do next, and when.

You are a top contender in the Sudbury Horse Classic, one of the year's most important national horse shows. When you overhear a man plotting to kill a horse insured for half a million dollars, you realize there's more at stake here than a blue ribbon. If you don't act fast, this prized show jumper will lose its life. You could go to the authorities, but by the time they arrive it might be too late. What will you do?

Meet Princess Peregrine Yvette (aka "Princess Dirt"), who has the manners of a gentle lady but the kneecaps of a troll. Her mother plans to send her off to princess camp on Princess Island for outdoor adventure and a bit of polishing up on the royal skills, but Princess Dirt's heart is in the wilds of nature. YOU can decide to behave like a royal or embrace the dirt within you.

You built a robot friend names Gus out of spare parts from your parents' lab. Gus isn't afraid of anything, EXCEPT the Robot King. How does the Robot King get all of the robots to do what he wants? And why is the top-secret robot lab downtown filled with tanks and tanks of jellyfish?

You, the reader, are searching for a priceless tea bowl, but you are kidnapped by a vicious Japanese gang. You decide how the story will go. (reissued as Cup of Death)