Supersleuths Petra, Calder and Tommy have an exciting new schoolproject - saving a famous building from demolition. But there's muchmore to the Robie House than bricks, glass and history - eerievoices, dark shadows, a moving roof, and inexplicable accidents...In no time the young trio are caught up in a petrifying search forghosts, lost treasure, and a coded message from the architect FrankLloyd Wright. In a tangled mystery where life and art interminglewith death and danger, can they keep their wits about themand escape with their lives?