The Midnight Line by Lee Child

The Midnight Line is Lee Child’s latest thriller. Jack Reacher, ex-military police drifter, finds a woman’s West Point ring in a pawn shop. He assumes the woman has fallen on hard times and begins a quest to find her. What he finds is an illegal drug network and lots of troubles, including a disabled vet with a narcotic addiction. Convincing her to accept his help proves difficult especially with a drug dealer marking him for death.