<P> Sheriff Andrew Jackson (Lenny Von Dohlen) rules the death an accident, but Shawn receives the Dewey Decimal Classification number of a book, Reincarnation and Rebirth, the title of which parallels the revelation that Paula had supposedly drowned in Santa Barbara, California seven years earlier, though her body was never found . Bob reveals that Michelle's unstable sister Lucy left Dual Spires, taking with her Paula, whom Michelle and Bob had all but raised . When Paula sent them a letter detailing the drug use and child abuse, they helped Paula fake her death so she could leave Lucy . Detectives Juliet O'Hara (Maggie Lawson) and Carlton Lassiter (Timothy Omundson) reopen the case and leave to issue a warrant for Bob's arrest . </P> <P> Shawn and Gus continue the investigation and, finding an entry in Paula's diary about meetings with "J", are led to partially blind photographer Jack Smith (Ryan McDonald). Jack reveals a photograph of Sheriff Jackson's son Randy (Scott Lyster), taken just before Jack was attacked during a walk with Paula . Randy reveals that after he attacked Jack, Paula confronted him about his ex-girlfriend, who Shawn deduces is librarian Maudette Hornsby (Sherilyn Fenn). However, Hornsby is found hanged at the library, and Sheriff Jackson and Dr. Donna "Doc" Gooden (Sheryl Lee) rule that Maudette killed Paula out of jealousy and committed suicide to keep the town from knowing about the affair . Shawn, however, deduces that Maudette was the one that led them to the festival and left clues for them to decode . </P> <P> Suddenly, Shawn and Gus are locked in the library and it is lit on fire, but they are rescued by Father Peter Westley (Ray Wise). Bob, who is revealed to be Paula's biological father, explains that after World War I, his great - grandfather established the town with two other soldiers, intending to create a secluded utopia . After the sawmill fire in 1958, the town began to look at all outsiders as a threat . When Doc Gooden and Sheriff Jackson enter and hold him at gunpoint, Shawn deduces that they are the leaders of the other two founding families . Due to Gooden's infertility and Jackson's terminal cancer, Randy was the only known direct descendant and therefore the sole future leader . To stop Randy from leaving town with a paranoid Paula, the sheriff and doctor drowned her . After Lassiter and O'Hara arrive and arrest Gooden and Jackson, the group celebrates at the diner, only to be repulsed by a number of oddities referencing Twin Peaks . </P> <P> "Dual Spires" was the fourth episode directed by Matt Shakman, the sixth to be written by producer Bill Callahan, and sixth to be written by series star James Roday . It originally aired in the United States on December 1, 2010, on USA Network as the 12th episode of Psych's fifth season and the 75th episode overall . It was an extended episode, at 67 minutes including commercials or 50 without . </P>

Where was the psych episode dual spires filmed