Here be Monsters - S10.E127

It is Halloween, and a young traumatised boy is brought into the police station. He will not speak, and it takes all of Jimmi's skill to help him. He is intrigued by the boy's drawings, and soon realises that they may provide a clue to as to why the boy refuses to speak. He persuades the police that a murder might have taken place, but an overzealous policeman puts the boy's life at risk and Jimmi must save him.

Heston invites everyone to a Halloween party. Everyone is keen to see Heston's house, and when he appears in a Rocky Horror-style outfit, their suspicions that he is gay are confirmed. He tries to chat up Lily to no avail. Daniel, however, chats up Ruth and takes her home.