Episode 13 of Twin Peaks, "Demons," originally aired on November 3, 1990, and was directed by Lesli Linka Glatter. This episode offers important information on the nature of Killer Bob as a spirit who requires a human host. Donna and Maddy fail at their mission to steal Laura's diary when Harold goes mad and threatens them. After James saves them, Maddy begs him to forget about her and get back with Donna. Agent Cooper takes the rescued Audrey to the Bookhouse. After finding out it was Jean Renault who trying to kill him at One-Eyed Jacks, Cooper returns the ransom money to Ben, who pleads ignorant of the whole scheme. Cooper's supervisor, Chief Gordon Cole (played by series creator David Lynch), arrives in Twin Peaks with a lab report and a message from Windom Earle in the form of a chess move. Josie makes a deal with Ben, gets her money, and is forced to leave town with Jonathan. At the Great Northern Hotel, Mr. Tojomura and Ben have a confrontation, but are interrupted by the crazed Leland's song and dance. The episode ends with the interrogation of the One-Armed Man, who reveals clues about Killer Bob by way of his schizophrenic other self, Mike.
by Andrea LeVasseur synopsis