Love Bleeds Deep - Fatal Fidelity, #2

With her husband dead, Justine finds herself balancing newfound freedom and a blossoming relationship with Campbell. They steal her away to a slice of paradise in France, but it's a working holiday, and their new contract is a heavy hitter. A local diplomat wants her ex-boyfriend-also her ex-bodyguard-dead. He's been stalking her for weeks, and his years of experience as a Special Forces interrogator make him a hard target to catch.
He'll kill anyone who gets too close: Campbell included. Campbell is used to giving up everything for the job, but old memories and old friends leave a weakness to exploit. Justine takes Campbell back from the brink of a violent collapse, but it comes at a dire price. What survives afterwards will change them both forever. The books in the Fatal Fidelity series are best read in order.