Meet shy mermaid Atalanta Scrimshaw. She lives in the quiet backwater of Sleepy Cove, collects messages in bottles, rides seahorses and enjoys the hobby of 'walking' on the beach and visiting friends. Life is perfect, until Atalanta learns of plans by developers Bristle & Splinter to transform Sleepy Cove into a luxury, seaside golf resort. Realising that this plan will destroy her home, she enlists the help of her friends, old and new, to try to stop it...