The Visitor by Lee Child (Jack Reacher #4)

Featuring Jack Reacher, hero of the blockbuster movie starring Tom Cruise.
Sergeant Amy Callan and Lieutenant Caroline Cooke have a lot in common.
Both were army high-flyers. Both were aquainted with Jack Reacher. Both were forced to resign from the service.
Now they're both dead.
Found in their own homes, naked, in a bath full of paint.
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.