Episode 5 is the fifth episode in the Mindhunter series. It premiered on October 13, 2017.
Holden and Bill return to Pennsylvania to help with the case. They talk to the fiancé of the victim, Benjamin Barnwright, because they think he's a suspect. They think he's faking tears but Holden isn't so sure. They return to Quantico where Wendy tells them that she's returning to Boston. Holden offers to drive her. They talk about the case while in the car on the way to the airport.
Holden goes to visit Debbie at her apartment. She's studying and they talk about Holden's work. He asks her how many guys she's been with. He's convinced that it's ten but she doesn't tell him otherwise. They get a call from Pennsylvania telling them that they've arrested a suspect. They return and they interview Frank. The fiancé tells them that Frank would harass Beverly, the victim.
Holden, Bill, and one of the police officers head to the bar. They discuss the case and the cop tells them about other suspects they could interview. Holden wonders if this case merits their involvement. They go the next day to talk to the fiancé's sister, Rose. She tells them that Benjamin might've done it because he asked her to bring cleaning supplies. She says that he got mad at Beverly and that he's responsible for her death. But she also admits her involvement because Frank said that they have to stick together. She saw Beverly's dead body and was there when they took it out to the truck. She was the one who cleaned up the mess and then she went home.
They ask her who killed her: was it Benjamin or Frank? She says she doesn't know.