The Alienist, written by Caleb Carr, is a thrilling alternative history mystery set in 19th century New York City. The story follows Dr. Laszlo Kreizler, a criminal psychologist, as he investigates a series of gruesome murders. With the help of a journalist and a team of experts, Kreizler delves into the dark underbelly of the city, unraveling a conspiracy that reaches the highest echelons of society.