British Intelligence has cracked the Enigma Code and Allied forces have, for a short time, inflicted heavy losses on the U-boat Wolf-packs. Plans are well advanced for the invasion of Normandy. Richard Tremayne, Flotilla Commander of a clandestine Special Force Naval unit is once more in the thick of it.

Mike Williams served eight years both full time and as a reservist, first in the Royal Navy [intelligence] as a Russian-speaking intercept operator, then in the Royal Marines [SBS and Commando], ending as a Second-in Command of a combined SBS and Commando RMR unit. He is married to the children's author Brenda Williams. They live in Wiltshire and regularly go hill-walking and canoeing in the Isles of Scilly.