Potshot - Robert B Parker

Boston PI Spenser returns - heading west to the rich man's haven of Potshot, Arizona, a former mining town reborn as a paradise for Los Angeles millionaires looking for a place to escape the pressures of their high-flying lifestyles. Potshot overcame its rough reputation as a rendevous for old-time mountain men who lived off the land, thanks to a healthy infusion of new blood and even newer money. But when this Western idyll is threatened by a local gang - a 21st century posse of desert rats, misfits, drunks and scavengers - the local police seem powerless.