Jac rushes in a mystery patient, whose arrival sets in motion in a deepening medical crisis that could have serious repercussions for her secret relationship with Kian. Keller is shocked when a new member of staff reveals the truth about Sacha's deception, and is tempted to take out his anguish on a vulnerable patient. Cameron basks in the glory of being declared a hero - prompting Nicky to issue him with an ultimatum.