As Megan sets a boundary in her relationship with Sid, Karen deals with an outbreak of vomiting at Campus. Ayesha receives a surprising offer of a place to stay and Ruhma worries she has turned Mrs Tembe into a monster! Can Megan uncover the cause of a young man's obsessive thoughts about hurting his partner?

Sid acts on his jealousy over Megan, but ends up making things awkward. Meanwhile, Ayesha's visit to Bren brings to light not one but two worrying discoveries. Heston helps a young medical student gain the self-confidence to stand up to his mother, and to realise where his future might lie.