Heartbeat - Season 7 - Eps 21: The Enemy Within
Mike and a college student become friendly. She has a Japanese camera, which causes friction between her and an old army friend of Blaketon's who's been having flash backs from the war. He causes a disturbance in the pub and Mike arrests him. Blaketon's friend is mixing up the past with the present and ends up making an attack on Mike and abducting Blaketon and abandoning him on the moors. Mike is then allowed two weeks off work so he takes the student way on holiday with him.
About Heartbeat

Title: Heartbeat
First Air Date: 1992-04-10
Last Air Date: 2010-09-05
Status: Ended
Rating: 7/10 (from 31 votes)
Language: EN
Seasons: 19
Total Episodes: 372
Network: ITV1
Genres: Crime, Drama, Comedy
Production Companies: Yorkshire Television
Synopsis
Set during the 1960s in the fictional North Yorkshire village of Aidensfield, this enduringly popular series interweaves crime and medical storylines.
Cast

Derek Fowlds
Oscar Blaketon

William Simons
PC Alf Ventress

Tricia Penrose
Gina Bellamy

Peter Benson
Bernie Scripps

Gwen Taylor
Peggy Armstrong

Lisa Kay
Carol Cassidy

Joseph McFadden
PC Joe Mason

Nikki Sanderson
Dawn Bellamy

David Lonsdale
David Stockwell

Steven Blakeley
PC Geoff Younger