One Shot by Lee Child

Six shots. Five dead.

A heartland city thrown into terror. But within hours the cops have it solved. A slam-dunk case. Apart from one thing. The accused gunman refuses to talk except for a single phrase:

Get Jack Reacher for me.

Reacher lives off the grid. He's not looking for trouble. But sometimes trouble looks for him. What could connect the noble Reacher to this psychopathic killer?

Although the Jack Reacher can be read in any order, One Shot is the 9th in the series.