Tom has a four-point plan to make his band, DogZombies, the best band in the world: 1. Write more songs. (Not about teachers) 2. Make a spectacular music video. (Easy) 3. Get some sleep. (Tricky when you're being kept awake by loud noises) 4. Annoy Delia. (Nothing to do with DogZombies but always fun.) What could go wrong? Meanwhile, Tom's friend Mark Clump needs someone to look after one of his pets while his family is moving house. Tom can't wait. He's always wanted a pet. And Tom is thrilled to be caring for Marble the hamster instead of a snake, a spider or a skunk. But little Marble keeps everyone up all night with her squeaky wheel, which makes everyone, especially Delia, extra grumpy.