Episode 4

The staff gather at a funeral for patients, and Joan is in agony not knowing whether her fiance is alive or dead. It would be so dangerous if anyone knew her connection to the enemy, but Rosalie has previously seen the ring and now she watches Joan intently.

Joan's spirits are lifted by the arrival of thirteen Tommies from her home town of Liverpool - known as the Lucky 13. Joan has a fondness for these men, whose united spirit has given them a belief that if they all stick together, none of them will die. But when she discovers that one is much sicker than thought, she finds herself the victim of blackmail.

Elsewhere, Thomas seizes his opportunity to pursue Kitty, but she gets a shocking summons to meet with a mysterious figure from home. Will Kitty face up to her past, and where will that leave her budding romance with Thomas?

The return of an old patient causes ripples between Roland, Grace and Margaret.