My son was given 3 Vince Flynn books: Memorial Day (Mitch Rapp #5), Consent to Kill (Mitch Rapp #6), and Act of Treason (Mitch Rapp #7).   He wants to start this series from the beginning, so I'm looking for a deal on the first four Mitch Rapp books:  Transfer of Power, The Third Option, Separation of Power, and Executive Power.  He's also interested in Flynn's first novel:  Term Limits.   I'm willing to pay 3 credits for the 5 books, or 2 credits for the 4 Mitch Rapp books.  Or if you have the first 4 Mitch Rapp books, and #8: Protect and Defend, I'll pay 3 credits for these 5 books.

Also, does anyone have an opinion on whether these books are appropriate for a reasonably mature 16-year-old boy?