A new addition this modern classic series. Generations of readers have followed the adventures of lighthouse keeper Mr Grinling, his wife and their cat, Hamish, at the lighthouse. Mr Grinling has a puzzling mystery on his hands: someone is dumping rubbish into the sea! His nephew George thinks it could be pirates... or could the culprit be someone closer to home? A charming new story in this beloved series, with an important conservation message.