To Kill a Kingdom (Hundred Kingdoms)

This action-packed YA debut pits a deadly siren princess and a siren-hunting human prince against each other as they fight to protect their kingdoms.
Princess Lira is siren royalty and the most lethal of them all. With the hearts of seventeen princes in her collection, she is revered across the sea. Until a twist of fate forces her to kill one of her own. To punish her daughter, the Sea Queen transforms Lira into the one thing they loathe most―a human. Robbed of her song, Lira has until the winter solstice to deliver Prince Elian’s heart to the Sea Queen and or remain a human forever. The ocean is the only place Prince Elian calls home, even though he is heir to the most powerful kingdom in the world. Hunting sirens is more than an unsavory hobby―it’s his calling. When he rescues a drowning woman in the ocean, she’s more than what she appears. She promises to help him find the key to destroying all of sirenkind for good―but can he trust her? And just how many deals will Elian have to barter to eliminate mankind’s greatest enemy?
Alexandra Christo's young adult novel To Kill a Kingdom is a thrilling fantasy adventure.
"With well-crafted fight scenes and vivid descriptions, Christo has created a world of beauty and monstrosity that will draw readers in." ―
Publishers Weekly "Fantasy fans will like the idea of sirens and piratelike princes as the characters who are imaginative and well developed." ―
School Library Journal