The Blasted Mine. Rogue Adventures, #3

A former adversary, convinced Nigel's an angel, talks him into searching for her lost husband and the silver mine he sought-not knowing that her son craves vengeance. Mama Walsh took a bullet for her son, only to wake from her injury with a vision of Nigel Rowe-anthropologist turned adventure host-as the angel who saved her life. Surely, he's the man who can find her missing husband and put things to right in her life.
Intrigued-and knowing a ratings boost when he hears one-Nigel agrees, so long as her murderous son Cameron isn't involved. Alas for him, Cam's the one pushing his mother's wacky theories, hoping to get Nigel's head in his sights at last. With the help of his dead brother's corpse, and his old prison buddies, Cam plans for an ambush in the mountains north of Cabo San Lucas. He's even got a secret weapon it took a few more murders to acquire. Nigel's bodyguard, unable to talk him out of it, gears up for battle as they search for clues in the pages of old letters and rumors of ghosts in the hills. In the wilds of the high sierra, one false step could send this would-be angel straight to purgatory.