"When he signed up to be sheriff of this dirty little boomtown, Aaron Mackey knew he was asking for trouble. Once, when Mackey was the U.S. marshal for the whole Montana Territory, he swore no job could get any harder. But that was before he took down a few of the bank-robbing Hancock--and incurred the wrath of the gang's maniacal matriarch, Mad Nellie Hancock. And that was before every avenging outlaw and hired henchmen came crawling out of the woodwork...

Over the past twenty years, William "Bull" Kelly acquired a reputation as one of the best ramrods in Texas. He has led legendary cattle drives to almost every railhead in the middle of the country. Most impressive of all, he once drove his herd all the way up to Montana. But after years of working for other people, he decided to run cattle on his own, with his five sons. Everything starts off fine, but when a group of cattle thieves try to stampede...