The Assassin's Case by Craig Alexander

The Assassin's Case by Craig Alexander
https://www.amazon.com/Assassins-Case-Craig-Alexander-ebook/dp/B002DYIMPQ

For twelve years former FBI agent Grant Sawyer has longed for the day when he can reap vengeance on the man who murdered his family. When he foils the theft of a briefcase containing an exotic biological weapon, he gets his chance.

An action packed adventure with two reluctant participants; one seeks redemption, the other retribution. Who will survive?