Carl Morck, a former top-rated detective in Edinburgh, is assigned to a new cold case whilst wracked with guilt following an attack that left his partner paralysed and another policeman dead.
several scenes discussing the physical, psychological, and emotional abuse of two boys by their mother through various means, including confining them for long unspecified amounts of time
Spoilers!!!! Neglect is described by Merritt and William’s dad and the Jennings brothers are both abused by their mother by being locked in the pressure chamber
It's actually a fake spider someone places on her hand whilst listening to an audio clip about arachnophobia, it's not a real one but still kind of creepy
In a way yes It is consensual between two adults at the time but SPOILERS it is later revealed that one of the people was pretending to be someone completely different
A man has a woman captive, while she’s sedated he kisses her neck without consent. Also, a teenager is threatened with sexual violence in another episode
Several characters punched or kicked in the face in or around the eye. One develops a "dead eye" after being kicked and another is hit in the eye with a hammer, though the visuals are not detailed and the camera quickly cuts away. Another character lost an eye in an off-screen attack and the resulting scar over her eyelid and face is shown, as well as a piece of gauze over it from a scene taking place shortly after. There are a couple mentions of taking an eye out.
I would not personally say excessive, but it is a bit bloodier than most cop/mystery shows. most of the gore is offscreen, unfocused, or quickly cut away from, though there is a slightly lingering shot of a man's face after being hit with a buckshot.
We see Carl shower once and (spoilers) Merritt showers a few times in the chamber but there is little to no nudity, although Merritt is observed by cameras at all times
Several scenes in the visiting room of a prison. Another scene in a character's cell, but it is dark and not very detailed. Some of the logistics of incarceration (sentencing, confinement, transferring of an incarcerated person) are discussed.
While not technically mentally ill, a man with brain damage is shown hitting his sister/caretaker once. When he gets upset in some episodes, some characters are then on edge about him being violent again, but he is always calmed down.
Very graphically in the final episode of season 1. SPOILER and description ahead: when she's surrounded by police after having been caught, one of the perpetrators shoots herself in her car. She's shown putting the gun under her chin then the view cuts to the aftermath from above the car.