Grace's team combs for clues in the vanishing of a bull statue. Among the suspects: a testy ex-wife, a peeved artist and an employee who was injured during the statue's installation. Meanwhile, Grace's eccentric aunt arrives for a salute to Grace's father, a hero during the 1995 Oklahoma City bombing.

Grace heads an investigation when a body is discovered in a shallow grave in an apparent Native American burial ritual. She seeks insight from her Native American grandfather, but grows concerned when he displays signs of Alzheimer's disease.