Plunge into the Norfolk Broads as the Ds join up with the Coot Club once again, this time to solve a very baffling crime. "'Why shouldn't we be detectives too?'" When Dick and Dorothea arrive in the Norfolk Broads all set for a blissful summer on the river, they find their friends the Death and Glories in a very bad situation. Accused of setting boats adrift, sabotage and theft, the boys are under suspicion by everyone on the river. And in the meantime, the real culprits are still at large. There's no choice but to form a crime-busting team: The Big Six. As the evidence stacks against them, can they solve the mystery and trap the real criminals?"