It's exam season - but Five Mile is in shock. A teenage boy was shot last night, with no clear motive and no clues.Garvie Smith - reprobate, genius and waster - was just getting down to a spot of revision. But he knows he's the only one who has any idea where to look for the answers. Starting with his best friend's girlfriend.Exams. What exams?

Simon Mason is the author of books for children including Moon Pie andThe Quigleys series, in addition to the young adult Garvie Smith Mysteries (the first, Running Girl, was shortlisted for the Costa Children's Prize). He has also written three adult novels and The Rough Guide to Classic Novels.