Alice is going through a tough time right now. Even though her mum and dad split up two years ago, she'd always hoped that they would eventually get back together. But when dad introduced his new girlfriend and her daughter and announced that they would be moving in, everything changed. School isn't any better, either. She's always getting told off in class and is jealous of her best friend Lucy, who seems to have the perfect family, but doesn't appreciate it. When mum sees how withdrawn Alice has become, she takes her to the pet shop to buy a hamster to take her mind off things. However, it's not a hamster that catches Alice's eye, but a sweet little mouse, with fur like cocoa powder. The trouble is, mum is terrified of mice!