As Will prepares for the biggest exam of his career, intelligence reaches the ship that a group in Montenegro may be about to target the crew while the ship is in port, so personnel are recalled for their own safety. Once they are back at sea, the Commodore discusses the ongoing threat from Russia in the light of the reported chemical weapon attack in Salisbury. HMS Duncan is then ordered to head straight for Syria after a chemical weapons attack there, but progress is hampered when they are forced to make an emergency fuel and food stop