Except for the special message from Admiralty headquarters, the British cruiser Marlin's new assignment seems routine enough to Chief Officer Webb Carrick. As part of the Fishery Protection Service, Marlin will be supervising a deep-sea fishing championship taking place off the Scottish coast, very close to off-limits submarine training waters. The Admiralty makes it crystal clear - there is a missing experimental torpedo and Carrick must take extra care to ensure that none of the competitive fishermen stray into forbidden waters. Soon Webb realizes, however, that someone is after more than just the usual catch...and then the corpse of a murdered fisherman turns up. And for Webb, the straightforward fishing championship is suddenly transformed into a sinister nautical mystery.Praise for Bill Knox: 'The expertise is interesting, the invention good and the writing literate and lively' - The Sunday Times. 'His plotting is impeccable...and he can build his books to a relentless climax' - New York Times. 'Always a thoroughly reliable, good read' - The Times. 'Sound technical details...thrills without frills' - Sunday Telegraph. 'The only practitioner who writes with complete authority and accuracy about the police procedures in Scotland' - Glasgow Herald. 'Bill Knox is a highly skilled professional...he stamps his books with his own brand of authenticity and accuracy and compelling plotting' - Irish Times. 'Knox writes with the factual accuracy of a good reporter. He does his homework thoroughly' - Evening Times, Glasgow.