In this fifth in the series, Oliver Redcastle, former Army sniper and Pinkerton agent, has moved from the city with his asthmatic daughter Chloe and her mother Marietta to the New Mexico mountains where he has taken up the more mundane occupation of sheep rancher.
A hard winter has tested both Redcastle's economics and the tempestuous Marietta's patience with rural life.
Alfie, another former Pinkerton detective and friend, attempts to enlist him in the search for another rancher's missing wife. Despite his need for money the search would bring in, Redcastle doesn't like the rancher and turns down the job offer.
When Alfie is fatally injured by a sharpshooter, Redcastle puts ranching on hold and goes in search of the killer. This brings him into contact with some dangerous characters, including a devious English aristocrat and two beautiful twins as dangerous as a pair of rattlesnakes.
Together they lead him on a quest filled with danger and to a surprising conclusion, which I found a bit rushed. But as a fan of this series I'll still recommend it to any who love colorful, well-drawn characters and situations.