"There's a murder on the streets of London, a plot that threatens the country and a dinner party to arrange. Only one man can help. Unfortunately, he's got a terrible hangover... Set in 1936, Murder Under a Green Sea is the story of Max and Martha Dalton, a young couple who seem to live a carefree life of luxury and dinner parties, far removed from the increasingly brutal world. When an old army friend is murdered, Max finds himself drawn into the crime and back to his own past. As the police suspect Max of the murder, he believes there must be a connection with a tragic crime committed in the muddy hell of the Western Front. Police suspicions grow along with a body count featuring one too many of Max's former comrades. With Martha, he sets out to unravel a knotted series of events, motivations and lies, while being pursued by a police force convinced that he's the murderer, and with unknown assassins hot on his trail. With the slightly dubious help of Martha, their maid, Flora, Flora's sweetheart, Eric, and a very confused solicitor, Max manages to uncover a plot that threatens the safety of the whole country."