Embark on an exhilarating journey alongside Cass Callahan into the heart of Texas-where answers are scarce and perils run as deep and enduring as the Rio Grande.

Following a series of traumatic events, Cass and his wife Raven leave Houston for the refuge of their recently inherited West Texas ranch, the CR. But the tranquility they seek begins to unravel when they cross paths with enigmatic neighboring ranchers and the intolerable Levi Flint.

Against the backdrop of expansive landscapes, Cass's resolve is tested. And when dead bodies are discovered on his land, he learns that the CR is concealing secrets darker than listless shadows. Uniting with the local sheriff, he delves into a world of deceit that threatens both truth and family safety-unveiling a mystery that stretches as far as the horizon.

Venture alongside Cass Callahan on a deadly journey into the heart of the CR, where danger and destiny are bound to intersect.

"Mullen's new series starts with an absolute bang ... Cass Callahan is a can't-miss character." -James Wade, two-time Spur Award-winning author of Beasts of the Earth