When the experienced and well-reputed psychologist Susanne greets the last client of the day, Mark, she is expecting a meeting like any other. But when Mark turns out to be a notorious serial killer, Susanne realizes that the next hour will change her life forever. Mark gives her an ultimatum: Unless she cures him, she will be his next victim. For every grain of sand that passes through the hourglass, the noose tightens, and an intense life-and death race commences.