This is book 5 of the "Spenser" series.

This note contains spoilers for the book.

This one's coming unglued. The physical book, I mean. Probably just random chance, I don't think it's a particularly heavily reread one for anybody here.

Spenser has a client who lost his family in a terrorist bombing in London (and was crippled himself), who wants to send Spenser after the terrorists. Amateurs, 9 of them were present for the bombing, and the client spotted and memorized their appearance well enough for a sketch artist to make recognizable sketches.

Then, just for fun, they get to follow the remaining couple of people to the Olympics in Montreal.

It's fun to watch Hawk traipsing around Europe buying shotguns and cutting them down.