<P> Jillian "Jill" Conway (Amanda Seyfried) lives in Portland, Oregon with her sister Molly (Emily Wickersham), a college student . Much earlier, Jill was kidnapped by a brutal serial killer who put her in a deep vertical hole somewhere in Portland's 5,100 - acre Forest Park . Jill found human remains, used one of the bones to stab her abductor, and escaped from the hole, using his rope ladder . When the Portland police are unable to find the hole, and discover that Jill had been committed to a psychiatric institution after her parents' death, they believe the abduction only happened in Jill's head, and sent Jill back to a psychiatric facility . </P> <P> A year later, Jill now works as a waitress in a local diner on the graveyard shift . She and her friend Sharon Ames (Jennifer Carpenter) are generously tipped by a regular customer . Returning home from the shift, Jill is shocked to discover Molly is missing, as she was to take an exam the next day and wanted Jill to wake her early . Molly's boyfriend, Billy (Sebastian Stan), tells her that he hasn't heard from Molly, and later that she didn't show up for the exam . Jill is then convinced the serial killer who took her has now taken Molly . </P> <P> Police Lt. Ray Bozeman (Michael Paré), Sergeant Powers (Daniel Sunjata), and Detective Erica Lonsdale (Katherine Moennig) dismiss her claims, trying to look for any other excuse for Molly to be missing, believing that it's all in Jill's head . The department's newest homicide detective, Peter Hood (Wes Bentley), tells her that he believes her, giving Jill his card in case she needs any help about the case . </P> <P> Jill interrogates her neighbors and learns that a van with a locksmith company's name on it parked in front of her house in the middle of the night . Jill finds the company it belongs to and talks to owner Henry Massey (Ted Rooney) and the van's driver, Massey's son Nick (Joel David Moore). When Nick denies any knowledge, Jill breaks into the van, where she finds a receipt from a hardware store for things that the killer would use . Jill holds Nick at gunpoint and forces him to reveal that he allowed a stranger named "Digger" to rent the van during the night . </P>

Who is the killer in the movie gone