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.
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 team hatches a plan to catch the killer; Moore checks in on a friend; Kreizler faces his own self-doubt about the investigation; Roosevelt attends an event with the city's elite; Sara looks into Kreizler's past; Connor acts on impulse.
The team learns more about the killer; Moore and Sara share an intimate moment; Kreizler seeks advice from an old mentor; Roosevelt takes action.
Kreizler and Sara discuss the capacity to kill; Moore goes on a date; Byrnes and Capt. Connor keep an eye on a potential suspect; Roosevelt finds himself under public scrutiny.
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; Sara attempts to live in a world outside the investigation.
A preview of the upcoming series.