Katie keeps her affair with a patient secret. Lawyer Siobhan is tired of trying to become pregnant by her husband, and is instead interested in a work colleague.

Despite Trudi's disapproval, Katie throws herself into an affair with Sam.

Siobhan struggles with her secret, and convinces her boss to promote Dominic to another branch.

Jessica is jealous of Alex's show of love for Lisa at their wedding and sleeps with a wedding guest.

Trudi's shocking discovery leaves her reeling, and Siobhan faces a devastating dilemma.

A guilt-ridden Siobhan confides in Jessica. Trudi and Richard go on an uncomfortable date, whilst Katie grows closer to Sam. Jessica discovers feelings for lesbian bride Alex.