The tiny hermit crab loves his new shell. He doesn't want to share it -- not with a blobby purple anenone and a tickly bristleworm. But life in the rock pool proves tougher than Crab thinks, and soon he finds he needs his new housemates in this rollicking story of sea, shells and friendship.Sharing a Shell Book and CD Pack features the first collaboration from the bestselling team; Julia Donaldson and Lydia Monks.