One of the "Plotbuster" stories, in which readers can test their sleuthing skills. Uncle Alf is in trouble, and readers can only help him if they can find a dinosaur jawbone. The story allows readers to travel in time and meet characters including a Victorian butler and an eccentric Roman emperor.

It's up to the reader to track down the poisoner of Eldon's water in this "Plotbuster" book. A cast of unlikely characters, such as Teddy Toxic, who claims to be an ex-rock star, populate the story, in which readers must unearth clues and crack visual puzzles to solve the mystery.

Set in the 23rd century, this story is part of the "Plotbusters" series in which readers can test their sleuthing skills. Readers are transported to the planet Jupiter where their quest is to seek out the last remaining toaster in the galaxy so that the High Priestess can enjoy a good breakfast.

This text tests young readers' sleuthing skills. Recruited by the Really Useless Spy School, readers are assisted by fellow pupils on a top secret mission. The pupils include a clumsy pickpocket, a forger who can't spell and an assassin who's scared of loud noises.