Gideon's Sword by Preston & Child

Gideon Crew sees his father shot in cold blood at age 12. When his mother dies, her last words were for him to avenge his father. After years of planning, Gideon finally has his opportunity. This is only the beginning of the story. There is a government official who is looking for someone with the skills of Gideon and offers him a job. This leads him to international intrigue, a shocking discovery and realization that he can't depend on the promises of others. An interesting twist at the end, this reader expects Preston & Child to come up with a sequel or series starring Gideon Crew. Lots of possibilities.