Retribution: Silent Death

Adam Walker is one of the Company's best field agents, a highly trained, well-honed killing machine when that's what's needed. But, he's also a man of many secrets, and one of them is that he's a ninja, one of Japan's mythical death warriors. When another of Adam's secrets, his best friend and the woman many believe to be his lover, is killed, he turns to the one person he trusts, fellow agent Shainna Barton. While Shainna covers for him on a mission, Adam metes out his revenge, and discovers that his friendship with Shainna has a much deeper meaning that either of them ever realized.