An IED explosion has hit Bluestone 42's mastiff, and they are trapped in hostile territory. Not everybody comes out of the vehicle unscathed and the team faces a difficult dilemma.

Nick is called in to rescue a squaddie during a major operation and he soon realises that this might not be straightforward and things take a worrying turn. Lt Col arranges a base pub quiz, and sends Mac and Rocket on a wild goose chase in an effort to cheat their way to victory.

Captain Ellen Best arrives and her presence affects Bluestone 42 in very different ways. Bird feels hostile towards her, while Simon is utterly infatuated. Her by-the-book approach is tested after Lt Col steals the team's fridge and after the team suffer an attack she is forced to make a difficult decision.

Ellen and Bird end up becoming room-mates, but end up at clashing over what Bird deems Ellen's ?girly' accoutrements. Towerblock is stunned to find out that his wife has been spending all their money on posh food. Word reaches the team that a Taliban attack is about to happen which does nothing to help Simon's paranoid suspicion about the new ANA recruit.

Ellen's rigid rule-following is not good news for Faruq. Mac and Rocket do some gladiatorial combat. Simon foolishly takes some advice from Bird as he tries to get Ellen to confront her feelings for him.

Mac and Rocket are determined to steal as many 'souvenirs' as possible before the camp closes whilst Towerblock's attempts to help mend Bird's broken family ties cause his wife to jump to the wrong conclusion.