I'm Two Assassin's Child (Nikita Fan-Fiction)

Audrey and her twin brother, Asher, were living the life of a rich kid in a happy home where they could do whatever they wanted. On a fun day out for the twins, well for Audrey, they get a call that makes them return to there luxurious home to find their adoptive family tied up with guns to their heads and their birth parents, Nikita Mears and Michael Bishop, sitting in the room. Audrey and Asher agree to go with them in exchange for their parents life. Will they become a family? Will the twin's pull away from their new found birth parents? Will the parents get closer? Will the twin's decide that the life of an assassin is to much? And what's their adoptive families secret?