When does The Alienist return?

The Alienist is an American period crime drama–thriller television series based on the 1994 novel of the same name. The ten-episode limited series first aired on TNT as a sneak peek on January 21, 2018, before its official premiere on January 22, 2018. The series stars Daniel Brühl, Luke Evans, and Dakota Fanning as an ad hoc team assembled in mid-1890s New York City to investigate a serial killer who is murdering street children. TNT ordered a sequel series based upon the 1997 follow-up novel The Angel of Darkness.
The first season is set in 1896, when a series of gruesome murders of boy prostitutes has gripped New York City. Teddy Roosevelt calls upon Dr. Laszlo Kreizler, a criminal psychiatrist, and John Moore, a newspaper illustrator, to conduct the investigation in secret. The team finds opposition within the NYPD, primarily from Captain Connor and the recently retired Chief Byrnes. In the second season, set a year later, Sara has opened a private detective agency.