After his career is destroyed, a brilliant but arrogant surgeon gets a new lease on life when a sorcerer takes him under her wing and trains him to defend the world against evil.

Tess is a geologist (because, of course, geologists control the time travel of the giant ancient machines) and a member of the Daughters of Harriet (Senator Harriet Tubman, that is, from 19th-century Mississippi). On the surface, the Daughters are time travel scholars, but in reality, Tess and her fellow Daughters are fighting a pitched changewar for women’s rights against the oppressors known as the Comstockers. One more thing: While she’s at it,Tess also hopes to also save the souls of her teenaged self and her underground feminist punk friends in the 1990s, with a particular focus on their vigilante killing spree and young Beth’s abortion.