The Spiders of Halros (The Arros Chronicles Book 1)

Kristina's eighteenth birthday celebration should be the best night of her life. Especially, given that she's a princess and the heir to the throne. But, when the King is poisoned, only the fast thinking and courage of her sisters can buy the time needed to find a cure.
The Spiders of Halros is a classic fantasy adventure. It pits six sisters against unknown enemies, on a quest, not only to save their father, but to survive the chaos unfolding across Arros.