Reacher's back, and continues in his dangerous habit of getting involved in massive, murderous conspiracies through pure chance and coincidence. It's as if God (in the person of author Lee Child) has it in for him.
In this outing, a lawyer in the service of a drug baron is driving erratically in a South Dakota snowstorm, just badly enough to cause a tourist bus filled with old people on a jaunt to Mount Rushmore to swerve off the highway.
Filled with old people, and also Reacher. Big mistake, lawyer.
The accident causes the bus passengers to be taken in by the decent citizens of Bolton, SD. Their town has recently been blessed with a massive nearby Federal high-security penitentiary. This provides local jobs, a steady traffic of sad people visiting prisoners, and (for some reason) a biker gang dealing high-quality crystal meth from a mysterious facility outside of town.
All this wangles Reacher into unravelling various mysteries and conspiracies, and also attempting to protect the life of a feisty old lady, who's promised to testify against one of the bikers who got nabbed. As always with Reacher: dry humor, sudden violence, lots of corpses.
Don't want to spoil anything, but the book has an unexpected ending, an unusual incentive to buy the next book in the series. Like, right now.