Buried Secrets by Carol Ericson

They’ve been warned to stay away, but they won’t be deterred that easily.

To halt construction of a casino on Yaqui land, ranger Jolene Nighthawk plants damning evidence. But she’s caught by her ex Sam Cross, a Border Patrol agent with his own interest in the land…and Jolene. There may be bodies beneath the desert, victims of a murderous cartel. As Jolene and Sam investigate, they find that theirs may be the next bodies hidden in the Arizona sand.