Honor’s Revenge by Mari Carr

To find a killer, they’ll have to use her as bait.

World class assassin Lancelot will do anything to get the job done, including lie to his new partner, billionaire professor Hugo. But Hugo has secrets of his own, and when the mission looks like it will fail, he has no choice but to seek out a woman who has no place in their war–Sylvia.

Hugo wants to protect her. Lancelot knows they need her help. Neither expects the explosive attraction between the three of them.
In the hunt for an enemy who will stop at nothing to bring down the Masters’ Admiralty, both men are forced to decide between completing their mission or saving the only woman they could ever love.