Baby Prisoner of the Winter Castle (Novel)

Clarisse should have been executed when her kingdom was invaded. But due to a law that prevents captives of war from being slain until they turn eighteen, Clarisse is now stuck living with Maximilian Sheridan, a duke of the invading kingdom who's a little too good at justice and not so good at dealing with children. Though death awaits, Clarisse is grateful that she's allowed to live for a bit longer alongside Squishy, her rocky friend. Can Clarisse grow up healthily enough to... well, die?