40 gunslingers vow to kill Tell Sackett after they've murdered his bride and chased him into a hole. But all of a sudden Sacketts are coming out of the woodwork like crazy and the outlaws find they've bitten off just a little more than they can chew.
The Sackett series is wonderful. Best to start with the beginning of the Sackett family, when they were still in England, and follow their progress to the east coast of America and then across the continent. You won't regret it.