One year after The Alienist, with Sara Howard, now a private detective, seeking out Dr Kreizler's help in finding the kidnapped infant daughter of a visiting Spanish dignitary. Dr Kreizler reunites with Sara, John Moore and the rest of the original team, with their search for the missing child bringing them into contact with a mysterious woman with a murderous past who is connected to a notorious gang. Written by kelliejan

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Sara persuades a young nurse to disclose what happens behind closed doors. Meanwhile, Kreizler is convinced that hypnosis might unlock the traumatic memories of Señora Linares, and Moore introduces Sara to a well-connected friend to further the investigation.

The clock is ticking for the team to locate baby Ana. Meanwhile, Sara is worries about her young undercover detective Bitsy Sussman, and William Randolph Hearst hosts a lavish ball celebrating his goddaughter Violet's engagement to Moore.

Sara, Kreizler, and Moore travel to Brooklyn in search of clues hidden in the killer's dark past.

Sara, Moore and Kreizler struggle with decisions about their future paths.