When Donna has to deal with Derek's meagre effects, she finds herself on a trip that begins as a joyride and ends with her confronting serious responsibilities. Along the way she learns a lot more about her father, and discovers a new family member. Joseph's determination to get to the bottom of Faye's suspension drives him to compromise his professionalism by confronting Lauren, against Michael's advice. Judith is determined to prove her sceptics wrong, but when her new infection control measures backfire and Mark saves the day, she realises Mark is worth his weight in gold.