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The U-949 is endangered by Commander Buchner's orders as Forster finds a lead in a casino and makes the acquaintance of the German Bettina Gruber.
As Forster investigates the Dorfmann murder in Lisbon, the U-949's new sailors get into a fight in Kiel and Swinburne attends his son's funeral.
Swinburne sets sail with a technologically upgraded ship, Ehrenberg makes a difficult decision and Forster tries to get a traitor out of the country.
Three thrilling storylines intertwine in this season. Chief engineer Ehrenberg and his crew have to fulfill an impossible mission. Forster and Hoffmann find themselves working together in Lisbon. Hannie Lessing struggles and subsequently plays with fire.