Riley Watson's latest assignment is to investigate Boone Fowler's renegade militia group. While doing so, he meets and falls for the owner of the land they're renting, pregnant widow Courtney Roberts. Riley's not sure if Courtney is mixed up with the group or just an innocent victim. Then someone starts taking potshots at the mother-to-be, and the mission turns personal. Courtney has wiggled her way into his heart, and Riley's Retribution (4) is going to be swift and vengeful. Rebecca York's suspenseful and fast-paced installment of the Big Sky Bounty Hunters series is the perfect wrap-up to this action series.