Prime Suspect 1973 (also known as Prime Suspect: Tennison) is a British television detective drama series starring Stefanie Martini as the young Jane Tennison. It is a prequel to the long-running Prime Suspect series that had starred Helen Mirren. The series debuted on ITV in the UK on 2 March 2017, comprising six episodes. In June 2017, it was confirmed there would be no second series.