Fictionalised story of the events which led to the sinking of the Titanic's sister ship, the Britannic. Vera Campbell (Amanda Ryan) is a British secret agent sent undercover on the Britannic to search out possible signs of German sabotage. On board, she meets the ship's vicar Reynolds (Edward Atterton) and the two become strongly attracted to each other. But Vera also realises that the ship is in grave danger and from the most unexpected quarters.