Other Voices - S11.E62

Slater and Keane deal with a violent stabbing at a home for the mentally ill, but their investigation is hampered by hidden loyalties for the homeowner, Joy. Despite their initial thoughts that the person responsible could be another of Joy's houseguests, when the victim regains consciousness, she identifies Joy as her attacker, and Slater and Keane realise they have been pursuing an innocent suspect.