Holly, a private detective's assistant, becomes insanely obsessed with the case of a missing girl, Tara Stokes, who is believed to have been kidnapped and murdered fifteen years ago. As insoluble fragments of Tara's childhood come to light, Holly's boss Spencer grows angrier that she's neglecting other jobs, and Holly becomes increasingly unstable. When she finally snaps, Holly reaches breaking point and the source of her obsession is revealed.