Unfortunately, Carter meets a strong-willed crime boss who is every inch his equal, and he contemplates his place in the spy game as a result. But there's more action than introspection, including a helicopter versus skier fight and a memorable wresting match against a Turkish villain, both in a remote mountain fortress.
Nick Carter starred in hundreds of spy novels, written by a legion of writers, and I read a ton of them as a teenager. I have recently gone back and revisited all three of the ones by Martin Cruz Smith (a favorite contemporary author) written in his peanut-butter days, and liked this one the best. It's a good second-tier spy novel on its own merits.
I would rank them as this one, Code Name: Werewolf, and then The Inca Death Squad for those interested.
I tracked this one down on eBay and read it quickly. I might go back and look for more Nick Carter spy novels if the pseudonymous author is a good match for more interests.