The Alienist

A psychologist, a newspaper illustrator, a secretary and a police commissioner begin an investigation outside the law to find a serial killer targeting boy prostitutes in 1896 New York City.

The investigation heats up as Sara gets her hands on a clue and Kreizler tries to connect the evidence left behind by the serial killer. Tensions rise within the police department.

Innovative evidence leads the team to discover a crucial element in the case has gone missing. Kreizler and Moore interview a witness to find out what happened to Moore at the brothel, and Sara attempts to live in a world outside the investigation.

Kreizler and Sara discuss the capacity to kill, and Moore goes on a date. Byrnes and Capt. Connor keep an eye on a potential suspect, and Roosevelt finds himself under public scrutiny.

The team learns more about the killer, and Moore and Sara share an intimate moment. Also, Kreizler seeks advice from an old mentor, and Roosevelt takes action.

The team hatches a plan to catch the killer and Moore checks in on a friend. Kreizler faces his own self-doubt about the investigation while Roosevelt attends an event with the city's elite. Also, Sara looks into Kreizler's past.