When Harold is invited to a fancy dress birthday party, he and his friends must come up with some fantastic outfits. The party is going really well but when the birthday boy's cake is stolen during a game in the dark, everyone is a prime suspect in the mystery of the missing cake. Can Harold piece the clues together to solve the mystery and save the party? Find out in this fantastic new adventure starring everyone's favourite fox detective, the irrepressible Harold. A funny story which encourages honesty and sharing, this is set to become a family favourite.