Past Life follows Jason Frey (Aneurin Barnard), an investigative reporter who reluctantly agrees to attend a hypnotism event with his pregnant wife Claira (Pixie Lott). Under hypnosis, Jason witnesses a murder through the eyes of a PSYCHOTIC killer. Haunted by what he has seen, Jason partners with the hypnotist (Jeremy Piven) to use 'past life regression' techniques to investigate a series of unsolved murders from the 1980s while unwittingly reawakening a psychopath’s killer tendencies.