Grace Milton's peaceful life with her family on a horse ranch outside Tombstone, Arizona is shattered in one devastating night. Her parents and siblings are all brutally killed by the notorious Guiltless Gang, leaving Grace the only survivor. Alone and desperate, she buries her family and sets out into the wilderness on her trusted stallion, Bullet, with burning thoughts of revenge. But when she falls ill on the trek, a young man called Joe saves her life by taking her to an Apache camp to heal her body and spirit. She begins to learn their ways, and despite all her heartache, she finds herself beginning to fall for Joe. But vengeance is never far from her mind, and the effort to find peace and forgiveness is a constant struggle—especially when she encounters one of the Guiltless Gang, Doc Slaughter, by chance. Will she fall into the darkness, or can Grace channel her newfound skills into a means of survival as a bounty hunter?