Horsegirl, a trans woman in her thirties, lives a life of routine alongside her father, Cowdaddy, in a forgotten town in Southern Pennsylvania—until she falls in love with Bethel, a new-to-town teacher with a goal of improving the lives of everyone they meet. Over the course of their summer romance, Bethel physically transforms Horsegirl into the person (or thing) they want her to be. Cowdaddy’s attempts to pull his daughter back to him leads to an explosive confrontation between all of them, in the wake of which Horsegirl must decide for herself what a happy life looks like.