A river of royal blood / Amanda Joy.

Seventeen-year-old Eva must harness the magick inside her to defeat her older sister, Isadore, as well as other forces, and win the crown in the Queendom of Myre--or die trying.

Eva is a princess, born with the magick of marrow and blood. But it is a dark and terrible magick that hasn't been seen for generations in the fractured country of Myre. The last known practitioner was Queen Raina, who toppled the native khimaer royalty and massacred thousands, including her own sister, eight generations ago. Eva must face her older sister, Isa, in a battle to the death if she hopes to ascend to the Ivory Throne-- because in the Queendom of Myre only the strongest, most ruthless rulers survive. When Eva is attacked by an assassin just weeks before the battle, she learns it isn't just her sister who wants to see her dead. Forced to turn to a fey instructor and a khimaer prince for help in growing her magick into something to fear, Eva will soon have to choose: Isa's death or her own. -- adapted from jacket