Night School by Lee Child
Paperback in very good condition.
Cover price is $13.50, asking $4.00.
From the back cover:
It's 1996, and Reacher is still in the army. In the morning they give him a medal, and that night he must go back to school. Off the grid. Out of sight, out of mind.
Two other men are in the classroom - an FBI agent and a CIA analyst - each wondering what the hell they are doing there.
Then they find out: A Jihadist sleeper cell in Hamburg, Germany, has received an unexpected visitor - a Saudi courier. A CIA asset, undercover inside the cell, has overheard the courier whisper, "The American wants a hundred million dollars."
Reacher and his two new friends are told to find that American. Reacher recruits the best soldier he has ever worked with: Sergeant Frances Neagley. Their mission heats up in more ways than one, while always keeping their eyes on the prize: If they don't get their man, the world will suffer an epic act of terrorism.