Set in an alternate America where witches ended their persecution over 300 years ago by cutting a deal with the government to fight for their country, the series follows three young women from basic training in combat magic into early deployment.
After being blamed for the death of the vice president's daughter, the witches leave the army behind and become fugitives - but staying out of trouble is never easy. While Raelle and Scylla enjoy their reunion, Nicte tempts Tally with a new power.
The group seeks sanctuary in the mysterious Cession. The Unit learns the Camarilla is directly targeting the Mycelium, inspiring them to strike back. Petra and Anacostia work to determine President Wade's allegiance.
With the Cession Marshal on their heels, the Unit splits up. Scylla and Nicte attempt to draw the Marshal away while Tally, Abigail and Adil meet an old ally. President Wade’s political stance puts her in danger.
The Unit spends the Yule holiday plotting their next steps. Alder seeks out another steward of the First Song. Hearst, President Silver and Kara Brandt celebrate a victory.
The Council of the Great River convenes to hear the Unit’s testimony and decide whether to extradite them back to the U.S. Abigail attempts to convey the dangers of the Camarilla’s influence, and Tally ponders if the future is written in stone.
Tally reunites with her mother and finds a reason to keep fighting. Abigail and Adil return to Fort Salem to find their home has changed. Scylla and Edwin work together in attempt to reach Raelle. Anacostia and Sterling plot an escape.
Allies converge to protect the Cession from occupation. The Camarilla march on the Cession, ready to invade under the guise of smoking out our fugitives. Tally and Scylla team up while Abigail, Adil and Anacostia seek out President Wade.
The Unit races to rescue a captured ally. Alder and Tally journey to retrieve the penultimate piece of the First Song. Fort Salem finds itself under Camarilla’s control.
Abigail, Raelle, Tally, and Scylla speak out against the Camarilla during a trial leveled against all witches – will it be enough to turn the tide? Even in the darkest moments, joy is found.
In a climactic battle, the Unit and its allies team up to fight the Camarilla. Alder races across the world to find the final piece of the First Song.