The Poison Throne — Celine Kiernan

When young Wynter Moorehawke returns to court with her dying father, but she finds her old home shadowed with fear. The king has become a violent despot, terrorizing those he once loved. His son and heir Alberon has fled into exile and now there are whispers everywhere of rebellion. Meanwhile, Alberon's half-brother Razi has been elevated to his throne. He struggles to meet his King's demands while remaining loyal to his beloved brother and to his friend-Wynter. Now, she must choose- her father or her dreams, her friend or her king, her duty... or her love.