Invisible Detective

London, 1937: The Invisible Detective can solve any mystery, great or small - but no one's ever seen his face. Truth is, the detective is the creation of four extraordinary kids who combat crime in his name… London, today: Arthur Drake is not impressed by a publicity stunt. But if a celebrity wants to get lowered into the Thames in a glass box, that's his problem. Or is it? Soon Arthur discovers that it could spell disaster for millions of people. A Roman coin, a strange burglary, and a mysterious attack outside a graveyard. When Art and his friends investigate, they discover more than they…