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

Siobhan hopes she can get her boss to promote Dominic to another branch. Katie tries to contact Sam, who shows up in the middle of the night. Trudi tells Richard that she wants to stay together with him.

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

Four friends find their lives intertwined when they are all touched by infidelity.