A mother on the run from the police sacrifices her life for her pregnant daughter, while Dylan learns the power of belief through a patient who has a holistic therapist, and decides that the number four is unlucky for him. Charlie's continuing battle with Louis takes a dramatic turn when he finds his son in a drug den, and his threat to inject himself if Louis does finally leads to his offer of help being accepted. Meanwhile, Cal reveals he is taking exams with Ethan, Robyn breaks up with Zach, and Lily is on the hunt for a partner