Shale And Shatter. Undertow Sins, #54

Control is just the story we tell ourselves while we're falling. Three things you learn fast as a deputy U. S. Marshal: how to clear a room, how to read a lie, and how to bury your real reasons under a stack of professional ones. Deputy Marshal Ivy Blackwell has spent four years planning this transport. On paper, Weston Crowe is just a cooperating witness-a former associate of a brutal criminal syndicate who is finally ready to testify in exchange for limited immunity.
But paper lies. Weston is the only living person who knows what happened the night Ivy's sister was killed in a dark warehouse. He just doesn't know Ivy is the sister of the woman he failed to save. Deep in the sweltering, unforgiving depths of Coyote Canyon, their journey is violently cut short. A staged rockslide blocks the road, trapping them in 115-degree heat with depleting water and no cell service.
To survive, Ivy is forced into an uneasy alliance with the reclusive blacksmith. Weston reads the world in materials-stress points, fracture lines, and the moment before something breaks. He has spent years in the desert trying to shape iron because metal doesn't bleed, and metal doesn't keep secrets. While Weston uses his primal survival skills to protect her from the elements, Ivy runs her own operation in the shadows, holding a working radio she refuses to use just to buy more time with him.
But when an unknown attacker descends into the canyon under the cover of darkness, the boundary between professional duty and raw, consuming desire completely shatters. As the air grows thin and the threat closes in, the heat of the desert will strip away their armor, exposing the dangerous truths they've buried. In this canyon, they will either bend together, or the weight of their secrets will shatter them both.