Suicide Hill is the ultimate test of bravery. Few have conquered the treacherously steep slope without completely wiping out - or so the legend goes. And rumour has it that Marvin will be taking it on. Only Marvin isn't so sure. His new mountain bike is enormous - he can barely climb up on to it. And changing gears is out of the question! But will he have to ride down Suicide Hill in order to prove himself to his classmates? If he succeeds he will be a hero. If he doesn't, then everyone is about to witness the biggest wipeout ever.