Night School by Lee Child

It’s just a voice plucked from the air: ‘The American wants a hundred million dollars’.

For what? Who from? It’s 1996, and the Soviets are long gone. But now there’s a new enemy. In an apartment in Hamburg, a group of smartly-dressed young Saudis are planning something big.

In the morning they gave Reacher a medal, and in the afternoon they sent him back to school.

Jack Reacher is fresh off a secret mission. The Army pats him on the back and sends him to a school with only three students: Reacher, an FBI agent, and a CIA analyst. Their assignment?

To find that American. And what he’s selling. And to whom.

Although the Jack Reacher novels can be read in any order, Night School is 21st in the series.