Reg Sutton, recently retired fi eld agent with a British Intelligence Special Unit, is persuaded to undertake one fi nal job. He is sent on assignment to Sweden following the suspicious death of an English undercover agent. His task is to help the Stockholm Police, and liaise with the local police in Jämtland in Mid Sweden. Th e dead man is one of seven agents planted in the country during the late 1970s at the whim of the British Prime Minister. Now the Stockholm Police are asking questions and Reg has been sent on a low key mission to help gloss over the problem and arrange for the repatriation and retirement of the rest of the group. Th e problem is suddenly compounded when yet another of the group also dies in similar circumstances. Both deaths appear to stem from attacks by some mythical lake monster similar to that purported to be present in Loch Ness. Reg and Anna Petersson, the Swedish police advisor, begin investigating when attempts on their lives suddenly make it plain that they could be the next victims. But is the killer really a monster or is this an elaborate attempt to hide the identity of the real murderer?