The Benighted (The Benighted Saga #1) by A.M. Dunnewin
The book blurb;
‘ The King was dead.
His body was found slain in his room, only months after his son had been brutally murdered. Skylar Mandolyn, his daughter, has now become the last heir to inherit the throne. But instead of becoming Queen, she has been imprisoned for helping in the escape of Sir Harlin Brien, her knight who was framed for the King’s murder.