Season 1 of The Investigator: A British Crime Story premiered on July 14, 2016.

In June 1985 Carole Packman, a wife and mother mysteriously disappeared and has never been seen since. Her husband Russell Causley is now serving a life sentence for her murder, yet no body has ever been found. Throughout the case he pleaded his innocence and refused to talk. Mark Williams-Thomas re-investigates the disappearance of Carole Packman. With the help of neighbours and friends, he retraces Carole's last known steps.

Season 2 of The Investigator: A British Crime Story premiered on August 19, 2018.