Assassin Sol Sullivan fulfills a marriage contract, becoming bodyguard for Claire Linden. Claire holds the ancestral Black Jade Ointment formula, coveted by the Lawsons. Sol protects her, eliminating threats like the Lawsons' son, Zane, and the Matriarch. The Black Jade Ointment's secret is limb regeneration; the Lawsons will stop at nothing to get it. Sol and Claire join forces to bring down the Lawsons.