From IMDB:

With the world’s most recognizable city as its backdrop, LONDON KILLS will dramatize the experiences of a team of top murder detectives. Slick, modern and fast moving, the series will be shot like a cutting-edge documentary. Each episode of LONDON KILLS will focus on a different murder following the detectives as they uncover the truth behind the killing but will also have a serial story involving the lead detective’s missing wife.

From Acorn TV:

London’s best detectives take on its worst crimes in this sleek mystery series from the creator of Suspects. DI David Bradford (Hugo Speer, Father Brown) heads an elite murder squad, but the one case he can’t crack is the one closest to him – the disappearance of his wife. Also starring Sharon Small (The Inspector Lynley Mysteries), Bailey Patrick (Bodyguard), and Tori Allen-Martin (Unforgotten).

JULY 2019 ADDENDUM:

From Acorn TV you can now stream both season one and season two.  Season two also consists of 5 episodes. Finally in season two we learn what happened to Bradford’s wife and what he has been hiding from his team. Nonetheless, season two leaves enough unsolved threads so that there could be a season three.

ORIGINAL REVIEW:

From Acorn TV you can stream the first season on this detective series. Each of the 5 episodes last about 45 minutes.  Although the 5 episodes of the first season bring an investigation to a close, throughout all the seasons there is the continuing mystery of what happened to DI Bradford’s wife. In addition the investigation in the first season is closely related to that disappearance.

As far as detective series go, this one is on a par with most and offers some genuine suspense and character portrayal. Season one’s villain is effectively creepy.

Not bad!