Arthur wrestles with his guilt following the mugging as Chantelle insists on returning to work. However Chantelle's determination is challenged by a difficult patient. Mo tries to ignore William's first birthday, but when a familiar patient arrives needing her help, will she be able to maintain her distance? When Harry discovers it's Mary-Claire's birthday, he realises she thinks he's got surprise plans for her... can he wriggle out of them, or will he do the right thing and make her day special?