Season 3 follows the fortunes of a young U-boat crew as they engage in the Battle of the Atlantic, are hunted down by an obsessed Royal Navy Commander (Ray Stevenson) and are sent on a dangerous mission to the Southern Hemisphere. Together they form strong personal alliances under the command of Robert Ehrenberg (Franz Dinda).
Gordon visits Island Park, ID, to help rescue the stunning Angler's Lodge. The owner, who built the lodge with his own hands, has lost his passion after a family tragedy and it has almost cost him his business.
Still picking up the pieces after the death of Denis and the cover up that followed, Val Ahern’s world is rocked once again when a stranger turns up on her doorstep. The stranger introduces himself as Finn - Denis’ estranged son, and his existence is an unwelcome surprise for the family.