Two eleven-year-old misfits try to solve the mystery of a dead magician and stop the evil Dr. L and Ms. Mauvais, who are searching for the secret of immortality.

Stranded on an unmapped volcanic island, Bartlett and his companions find a people under the sway of the Machan, the holder of the true book . Is the Machan their host or their gaoler? They have five days to unravel the riddle before they must climb the volcano and never come back!

A journey through a land where Milo learns the importance of words and numbers provides a cure for his boredom.

World crisis: the planet's oil supply has been drained overnight. Your brother Ned and yu are called upon to investigate this mystery. You are a highly successful detective team. The search for the solution could take you all the way across the globe, and possibly even beyond.