Arthur and Morven receive some news which leads them to question what's really important - can love win out? Mo is full of regrets when she struggles to face up to her actions of the previous night. Will she realise before it's too late that her biggest regret will actually be letting someone go? Serena is forced to reassess her working life when she makes a mistake which has devastating consequences on the hospital and its staff.

Hanssen suddenly decides to be a hands-on surgeon on Keller, and Arthur is desperate to prove his worth. But when he has difficulty separating the personal from the professional, Arthur makes a heartwrenching decision. With the ice thawing between them, Oliver grabs his chance to get back with Zosia. However, disaster strikes when Oliver crosses a line. A secretive Raf makes a personal sacrifice when a newly empowered Fletch finally makes a date with Naomi.