Tom and Sophie Nightingale live on a barge with their zookeeper dad and vet mum, and as many animals as you can get on a small boat. Surely there's no room for any MORE animals in their life? When a tiger at the zoo has a dental dilemma, Tom and Sophie can't help but get involved. But there is a carnivorous culprit closer to home that they must also diagnose - and quickly! An animal-mad adventure written with the help of the brilliant team at ZSL London Zoo.