DCI Vera Stanhope is called to a remote lighthouse where a body has been discovered lashed to a sailboat. Immediately setting about her investigation, Vera soon discovers that the body is local council enforcement officer and experienced amateur sailor Frank Channing. A family man, with strong friendships, who was well respected at work, surely this really was just an accident? However, it's not long before Vera discovers evidence suggesting foul play. Vera and her team piece together Frank’s final days and soon discover that his life wasn’t all plain sailing.