After the Dorans' Halloween party everyone has an emotional and psychological hangover. Jane is devastated by the lack of support not only from the detectives investigating the case, but from Henry, leading to repercussions in their relationship. Meanwhile, Dr. Evans, who suffers from a gambling addiction, becomes beholden to Gavin in order to pay off a large debt. Finally, Gavin tracks down the person responsible for endangering Olivia and stealing his property, and is determined to end the trouble or risk losing The Drake and everything he owns. And in one horrifying moment, Jane pieces together how is she is connected to the history of the building. "Diabolic" airs on Sunday, November 4 at 10pm on ABC.