Claire Northcutt discovers she and her family are caught in the crosshairs of a vengeance-seeking murderer after she finds wild mustang rescue ranch owner J.B. Floren slashed to death on his Cimarron River ranch.The bloody scene reactivates her post traumatic stress; she killed a stalker who invaded her home years ago.The rancher's murder investigation soon focuses on her nephew, Denver, a horse trainer and Afghanistan veteran. Her teenage son, Cade, is certain of Denver's innocence.Claire struggles to keep it together and keep the attentions of her neighbor Holt Braden at arm's length after Denver is arrested for drugs; the police seem intent on charging him with the murder as well.Operating with hypervigilance, Claire digs deeper into the rancher's mustang rescue operation, uncovering possible motives for his murder and a silent partner. When Denver's girlfriend is badly beaten soon after Denver is released on bail, Claire's fears for her family intensify. Claire has attracted another stalker.The clock is ticking.