Arthur doesn't know how to cope on his first day back, as his first patient is Morven's Dad. Mo and Mr T face their feeling as Mo finds out whether or not she is pregnant. A family secret is revealed and Serena finds herself caught up in it.

A figure from Dominic's past arrives and sets of a chain of traumatic consequences. Zosia gets over-involved in the life of a patient. Bernie Wolfe finds herself out of her depth.