Troubled Waters is a murder mystery, set in the Channel Islands in the 1980s, with flashbacks to World War II during the German occupation. The location is Longuey, a small (fictional) island off the coast of Guernsey.
Teenager Robbie is caught up in a murder investigation, when he discovers a drowned body on his first day home from boarding school. The holiday island run and managed by his parents is descended on by police from the mainland. Their questioning probes island residents, hotel staff and guests, and day-trippers. As secrets from the past and present are gradually uncovered, Robbie faces uncomfortable truths within his own family, and realises his idyllic island home will probably never be the same again.