A series of murders have left police stumped, but as one woman will discover, the truth behind the killings may lay buried in the past. Haunted by her own demons from days gone by, a young woman named Roselyn takes a job working the graveyard shift at a closed down hospital. But soon, she witnesses disturbing events at her own workplace that would seem to shed light on the killings. The clues that pop up are increasingly fascinating - and deadly - but can she trust herself, or is her mind playing tricks on her? As her obsession grows, Roselyn may have no choice but to uncover the dark histories that hide in Psych 9, even if they lead to her own dark past.