Safe houses and secret message drops, double crosses and defections -- it sounds like the stuff of sophisticated espionage, but the agents are only schoolboys engaged in harmless play. But John Creevey doesn't know this. To him, the messages he decodes with painstaking care are the communications of dangerous and evil men, and as he comes face to face with the fact of his beloved wife Jennifer's defection, he begins to see a way to get back at the man she left him for. And soon the schoolboys are playing more than just a game . . .