The Alienist, based on the Anthony Award-winning New York Times bestseller by Caleb Carr, is a fast-paced and atmospheric psychological thriller set in the fascinating and gritty world of Gilded Age New York City. After a series of haunting and gruesome murders, psychiatrist Dr. Laszlo Kreizler, newspaper reporter John Moore and police commissioner Theodore Roosevelt come together employing emerging disciplines of psychology and early crime investigation techniques to track down one of New York City's first serial killers.
New York City. 1896. The heart of America's Gilded Age. When a young boy prostitute is found butchered on the unfinished Williamsburg Bridge, an alienist named Laszlo Kreizler, a newspaper illustrator by the name of John Moore, a secretary, Sara Howard and a police commissioner named Theodore Roosevelt begin an investigation outside the law to find the serial killer.
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. Kreizler takes Moore, Sara, Marcus and Lucius to Delmonico's in New York and informs them they are going to be working together as a team to catch the killer.
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. Kreizler challenges them to look within themselves.
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.
Kreizler and Moore follow a lead. Sara visits a hospital and is forced to confront her past. Cyrus, Kreizler's carriage driver, recovers from his injuries. Byrnes and Connor plot against the team. Detectives Marcus and Lucius Isaacson work on a clue.