It's been four weeks since the bloody showdown at Black Mesa, and Maggie Hoskie, Diné monster hunter, is trying to make the best of things. Only her latest bounty hunt has gone sideways, she's lost her only friend, Kai Arviso, and she's somehow found herself responsible for a girl with a strange clan power.

Then the Goodacre twins show up at Maggie's door with the news that Kai and the youngest Goodacre, Caleb, have fallen in with a mysterious cult, led by a figure out of Navajo legend called the White Locust. The Goodacres are convinced that Kai's a true believer, but Maggie suspects there's more to Kai's new faith than meets the eye.