There is a very slight suggestion that two characters may be having an affair, with the term "sexual relationship" used, but that's it. The series is clean beyond that.
Violence & Gore
Mild
Multiple dead bodies are shown at crime scenes, sometimes with lots of blood. Could disturb some.
Profanity
None
Episodes 1 and 2, no profanity. Episode 3, one use of "Oh, no, God..." and near the end, the young constable bites down on something and says, "Jesus."