Just like in every movies/drama, the police are clueless; Further more they disregard the discoveries presented to them by Susan Grey- (acted by Anna Maxwell Martin). This lead to the women having to investigate the murders themselves to try and stop the murderer from killing again- causing a rift between Susan and her husband Timothy - (acted by Mark Dexter).
The Bletchley Circle is definitely a nail biting drama. I am hoping for a second series. You can catch- up on all the episodes of series one on ITV Player,