Don Pendleton 
Extreme Justice [EPUB ebook] 

Defending the enemy It was supposed to be an open-and-shut case against a high-ranking mobster on trial for conspiring to aid Middle Eastern terrorists in a series of brutal attacks against the U.S. But the so-called "last don" of New York City is likely to be acquitted when mercenary hit teams kill every prosecution witness except one.Gilbert Favor is a retired money mover now living in Costa Rica, and is the government’s last hope. Mack Bolan’s mission is to track Favor and return him Stateside. But the money-laundering specialist is less than willing to come forward. The gunmen tracking him want silence by way of a bullet. The Executioner must deliver the witness alive, no matter what the cost.