Shoot the Messenger by Shane Kuhn
Meet John Lago: hitman, film fan, dangerously in love.
The object of his affection is Alice, who also happens to be John's nemesis, a fellow killer, and now the wife he never knew he wanted. Together, this thrill-seeking, lethal couple aim to take over John's former employers Human Resources Inc - a group of assassins who get close to their high-profile targets in the guise of office interns.
But an anonymous tip about an FBI mole in the organization drives a wedge between the happy couple and all hell breaks loose in a hail of bullets.
Til death do us part.
Published in the US as Hostile Takeover.