Overview
Jigsaw is a 1962 British black and white crime film written and directed by Val Guest and starring Jack Warner and Ronald Lewis. It is based on the police procedural novel Sleep Long, My Love by Hillary Waugh, with the setting changed from the fictional small town of Stockford, Connecticut, to Brighton, Sussex, while retaining the names and basic natures of its two police protagonists and most of the other characters. It was filmed with the full cooperation of the Brighton Borough Police, which was under the shadow of a major corruption scandal, and the East Sussex Constabulary.
Plot
A woman (later explained as Joan Simpson) argues with an unseen man. She wants to marry him but he moves to attack her.
Her remains are found both dismembered and incinerated, together with a knife and a hacksaw in a small furnace in Saltdean, near Brighton. Two local detectives, following up a small but odd burglary of leases at an estate agent's office, discover the body and take on the investigation of the death. The dead woman cannot be identified but they initially think she is called Jean Sherman, since a suitcase with the initials JS had been left at the scene. The main suspect is an unidentified man who has used the false identity of John Campbell to rent the house in which the woman was found. The detectives methodically develop and follow up leads to identify both people, mostly in Brighton, but also further afield in Lewes and Greenwich.
DI Fellows goes to Jean Sherman's house and discovers that she is still alive. He tricks her into giving him a name and address to get a sample of her handwriting, which is the same as that found in the victim's house. Flashback scenes in her story specifically exclude the viewer from seeing the man John Campbell. Miss Sherman admits a one-night stand with Campbell.
From Wikipedia (CC BY-SA 4.0).