«Black is My Heart» by Elise Noble

Two assassins. One little problem…
Finding dirt on politicians is usually easy, but Congressman Clements is more careful than most. Never one to back away from a challenge, devious Diamond enlists her old friend Snow in a scheme to catch their target in a compromising position. 
But the world of espionage rarely runs smoothly, and Diamond soon finds herself stuck in a tight spot. Can she save the job as well as fight her feelings for the man she loves?