Killian Ives rules the cattle trail with a stern hand and a voice that demands obedience from every man under his watch. The widow Unity has become the one complication he refuses to ignore, her soft defiance pulling at the isolation he has carried since the last drive. He means to seed her on this journey, to bind her to him with the child he plants before they reach the railhead.

Lightning cracks as rain soaks through their shirts inside the wagon. His palm presses to the birthmark at her collarbone and the command to lift her skirts waits on his tongue. A rival waits in the dark, the herd pushes forward under a tight deadline, and the trail boss stands at the edge of claiming what could save him or leave him more alone than before.