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... AN ANCIENT CURSE A new exhibit at the British Museum is hardly a matter for the Invisible Detective. Until it goes missing. When Art and his friends investigate an ancient Egyptian curse, they discover that things are much more serious than anyone suspected. Within a hidden tomb, a timeless terror is stirring, and the dead begin to waken. In the present day, Arthur Drake and his friend Sarah find that a history project can be dangerous, and that the Invisible Detective has left them some unfinished business to attend to...