True Peril (True Lies #3)
Veronica Forand

Some days no good deed goes unpunished.
Dane O’Brien has spent his life in the shadows. Once a lethal assassin he grew tired of losing his soul with every hit, trading his gun and missions for a conference table and office politics as an undercover operative for the CIA. But when visiting his humanitarian sister turns deadly, Dane finds himself swearing to protect her beautiful and passionate friend Trista no matter the cost…even if it means stepping back into the world he swore never to return to. Although falling for the tough-hearted Trista is easy, keeping her alive is hard.