Dr. Frankenstein’s Daughters by Suzanne Weyn

When Doctor Victor Frankenstein died, he left behind a legacy of horror. . . .as well as two unacknowledged, beautiful twin daughters. Now these girls are seventeen, and they’ve come to Frankenstein’s castle to claim it as their inheritance.

Giselle and Ingrid are twins, but they couldn’t be more different. Giselle is a glamorous social climber who plans on turning Frankenstein’s castle into a center of high society. Ingrid, meanwhile, is quiet and studious, drawn to the mysterious notebooks her father left behind. . . .and the experiments that he went mad trying to perfect.