Summer, 1942. The Second World War rages on, but Britain now faces the Nazi threat with America at its side. In a bombed-out London swarming with gangsters and spies, DCI Frank Merlin continues his battle against rampant wartime crime. A mangled body is found in the Thames just as some items of priceless art go mysteriously missing. What sinister connection links the two? Merlin and his team follow a twisting trail of secrets and lies as they investigate a baffling and deadly puzzle.