A Touch of Frost - Season 4 - Eps 5: Deep Waters
A sub-postmistress is fatally stabbed in a small-scale robbery, and Frost wastes a lot of time questioning the leading suspects. Then, Helen Tudor, a beautiful first-year psychology student and keen swimmer at Denton University, is attacked on the campus, and suspicion initially falls on her psychology tutor, Keith Michaelson, but Frost's investigations uncover a link with the death of another beautiful young girl swimmer two years earlier, in another town.
About A Touch of Frost

Title: A Touch of Frost
First Air Date: 1992-12-06
Last Air Date: 2010-04-05
Status: Ended
Rating: 7.5/10 (from 67 votes)
Language: EN
Seasons: 16
Total Episodes: 42
Network: ITV1
Genres: Drama, Crime, Mystery
Production Companies: Yorkshire Television
Synopsis
Jack Frost is a gritty, dogged and unconventional detective with sympathy for the underdog and an instinct for moral justice who attracts trouble like a magnet. Despite some animosity with his superintendent, Norman “Horn-rimmed Harry” Mullett, Frost and his ever-changing roster of assistants manage to solve cases via his clever mind, good heart, and cool touch.
Cast

David Jason
Jack Frost

David McKail
Dr. Mckenzie / Pathologist

David Gooderson
Derek Simpkins

Caroline Harker
Hazel Wallace

Bruce Alexander
Norman Mullet

John Lyons
George Toolan