Hello! Read Book One Vacant Memory first if you haven't.
Two years after Nikita found out her life has been a lie she goes back in time with her time travel powers to see her real parents. Acting as someone else, Nikita finds out something very shocking, and that she can change her whole life around so that none of this with the government experiment stuff happened in the first place. But, If she does, it will change more in the present day than she wants.