For retired detective Arthur Pembrooke, the only thing sharper than his investigative skills is the coastal wind. But his quiet life of painting hermit crab shells for tourists shatters when a notorious art collector is found dead, clutching one of Arthur's unique creations.The shell is more than a keepsake; it's a cryptic message only Arthur can decipher, pointing to a cold case he thought was buried forever. Now, the sleepy seaside town is buzzing with suspects, from jealous local artists to shadowy figures from his past.As a storm rolls in, cutting the town off from the mainland, Arthur must outsmart a killer who knows his every move. Can he solve the puzzle before the tide turns and he becomes the next victim?