You’ll need some patience with “Coils of Time," seeing as how it takes the hero, Rutherford Bohr Adams, twenty-some pages before you’ll realize that the story is a sequel to “The Sands of Time,” and it’s going to fall to space pilot Adams to travel through the 60-million-year coils of times into the future and the past, saving Earth from the evil Martians and their zombies, while also saving his own boss’s beautiful daughter from a fate worth than death.

In the moments before a jump, a traveler muses over the realities of time travel.

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.