Jack Reacher (abridged)31 books in series
The Visitor Publisher's Summary
Sergeant Amy Callan and Lieutenant Caroline Cook have a lot in common. Both were army high-flyers.Both were acquainted with Jack Reacher. Both were forced to resign from the service.
Now they're both dead.
Both were found in their own home, naked, in a bath full of paint. Both were apparent victims of an army man - a loner, a smart guy with a score to settle, a ruthless vigilante.
A man just like Jack Reacher.