Tim Tigner, Pushing Brilliance

Pushing Brilliance introduces Kyle Achilles, a former Olympic biathlete and CIA operative who runs into some serious trouble when he goes to his father's 60th birthday/retirement party.

Achilles ultimately has to prove himself and save the world, all while dodging hitmen and the authorities, but this is the sort of thing he excels at.

He's a likable protagonist with formidable skills, not least of which is being able to climb up seemingly sheer buildings and cliff faces with the agility of a monkey. A fun read.