Based on a true story Jigsaw is a good solid and atmospheric police procedural following a murder investigation. Jack Warner leads the investigation which takes place mostly in Brighton.
The police investigation is quite complicated with a lot of good old fashioned thorough investigation. This is easy to portray in a multi-episode TV series but more challenging in a single film with limited time, however this film pulls it off with fast pacing and many short scenes.
The film lacks much in what you would call "action", its a realistic police investigation that is being shown - expect checking ledgers not high speed car chases and what a refreshing film is it for all that.