One of the hundred books a year I read:

The Gray Man is part of the genre of highly-trained assassins who become a target of their own government and then must fight against impossible odds to save some innocent (think Jason Bourne or Jack Reacher). Former CIA operative Court Gentry becomes the target of an evil corporation who hires the best assassins from a dozen different countries (really) and must fight his way across Europe to save two little girls, the granddaughters of his handler (who also double-crosses him—until he helps him). He gets wounded in spectacular ways and still keeps going. Yep, totally improbable, but that’s the point of this genre—keep the action moving so fast you never have a chance to ask “But…” Greaney does a great job of never letting off the gas.