Detective Inspector Alex Ridley is retiring from the police after years of dedicated service. His replacement is DI Carol Farman (Waugh), his former protégée whom Ridley mentored for many years.
When he's enlisted by Carol as a police consultant on a complex and compelling murder case, the investigation takes a dark and unexpected turn. Turning to her old mentor for support, Carol is keen to access Ridley’s unique insight into crime-solving which has served them so well in the past. With more intriguing cases to solve, Ridley will revive his formidable and successful partnership with Carol.