Dr. Kreizler quits the investigation after Mary's murder. Moore and Ms. Howard continue their investigating.
The Alienist – Episode 9: “Requiem”

Dr. Kreizler quits the investigation after Mary's murder. Moore and Ms. Howard continue their investigating.
Kreizler and Moore run into interesting, if not dangerous circumstances on their trip to Washington.
Dr. Kreizler and his team try drawing out the killer. But the unexpected is about to happen.