“Am I a person?” Borne asked me.

“Yes, you are a person,” I told him. “But like a person, you can be a weapon, too.”

In Borne, a young woman named Rachel survives as a scavenger in a ruined city half destroyed by drought and conflict. The city is dangerous, littered with discarded experiments from the Company—a biotech firm now derelict—and punished by the unpredictable predations of a giant bear. Rachel ekes out an existence in the shelter of a run-down sanctuary she shares with her partner,...