Sisters in Power, The Crown Is Ours

The Litt fortune has an heir lined up and it is Micah, the son the family adopted. Eva Litt, swapped with another baby at birth, comes back to the family at eighteen and finds him in the position that would have been hers. Her sister Zelda is in the house too. Their parents keep to the arrangement and go on preparing Micah to take over. Micah sets Eva up, planting things on her and getting the parents to see her a certain way, and she catches him at it each time. Zelda has been fed his version of Eva for years and starts out against her. Eva keeps at her until she sees what has been done with her, and the two of them stop working against each other. From there they go at their parents' idea of who the family belongs to, and at the inheritance that should have come to them.