New York, 1896. Police commissioner Theodore Roosevelt brings together criminal psychologist Dr. Laszlo Kreizler, newspaper illustrator John Moore and secretary Sara Howard to investigate several murders of male prostitutes.
This tv show contains 66 potentially triggering events.
This is a difficult one to answer-- because of the time period (1896) there are some references to the young male prostitutes who dress as girls. It's not really clear whether they're cross-dressers or trans (partly bc that word hadn't been invented yet).
without any spoil: yes-ish
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//////// Mary dies
Very much so. One of the main characters was violently abused as a child and during the series he defends multiple children from abusive parents while in public and in private
S1E9
Beheaded dead cat under the floorboards. It is NOT skeletal and is only partially decomposed, the previous comment is mistaken. It is very clearly a dead tabby.
There are a few cases of a cat dying during the season. The last episode especially features the antagonist putting a live cat in a bag and violently smashing it against a wall.
It is not outright stated, but rather implied that multiple characters have been assaulted. One of them is a main character. He seems to have no memory of the event because his alcohol was drugged, but it is heavily implied he was assaulted after he lost consciousness
Sort of-- the gangsters that arrange the (off-screen, heavily implied) rape of one of the main characters joke about it the next day (i.e., "won't be sitting for a week" kind of comments).
There is no self-harm cutting, however in S1E9 Laszlo breaks a class and stabs his own arm (on purpose, self-harm). It is not graphic (no blood shown, no wound shown).
Although most of the children appear to be forced into crossdressing there are multiple mentions to others that do seem to actually be tranasgender (like the mentions of Benjamin) that are deadnamed and misgendered
The mental institution scene can be very disturbing, even for people that are normally fine with those scenes. There is a lot of screaming and crying, as well as people begging one main character for help while they are restrained in a chair. Feel free to skip this scene
Possibly/probably one way or another-- there are young male prostitutes who dress as girls (cross-dressers or trans isn't clear) that are addressed by both male and female pronouns. In S1E1, a cop uses "it" as a pronoun.
Though not explicitly mentioned, a lot of the victims at the centre of these cases are either implied to be LGBT or at least lgbt-adjacent, specifically transgender or gender non-conforming individuals. If you are sensitive to such themes, I would avoid this series.
There are multiple instances of sex scenes. Some consensual and other non-consensual. A multitude of these take place within brothels and some between adults and underage children/teenagers. It is a series heavy with sexual scenes.
A dog fight happens in episode two of season two around the 28 minute mark.