Castles in their Bones by Laura Sebastian
Born to rule. Raised to deceive. A new trilogy from the New York Times bestselling author of Ash Princess.
The plot: overthrow a kingdom. The goal: world domination. The plan: marriage. Trained for from birth in espionage and seduction, the triplet princesses of Bessemia must travel to three distant lands to marry three princes and enact their Queen mother’s plan to rule from sea to sea. But when they arrive, each sister discovers her task is not so simple, and their mother’s motives may not be what they seem.