An exhausted Fletch clashes with Abigail when an unexpected visitor turns up on the ward. Nicky tries to keep her head in the game as her personal issues distract her from a big case. Xavier's patience is tested by a tricky patient when details from his past comes to light.

Fletch is sent spinning with the arrival of several unexpected visitors on AAU. Roxanna's fears grow for Hanssen as he buries himself in his work. Nicky and Sacha bond over bacteria.