Crowntide (Lightlark, 4)

Isla Crown has decided to forge her own destiny and personally eliminate Lark, her insidious predecessor. However, along the way, she will discover that Skyshade is far more dangerous than she anticipated. Oro and Grim, meanwhile, will have to join forces, for they could never leave her alone on the path to certain death. Will these two great enemies be able to put aside the betrayals of the past? And most importantly, will Isla ever understand what her broken heart desires? They must act quickly… The fate of the kingdoms hangs in the balance.