I also finished this book a couple of days ago and I loved it. It‘s a thoughtful and incredibly powerful book inspired by the Black Lives Matter movement. I highly recommend it.
To Kill a Kingdom is a dark retelling of the Little Mermaid. Elian, a prince/pirate/siren killer and Lira a feared siren princess who steals a heart each year meet under unusual circumstances. Lira disobeys her mother and she turns her into a human. Elian finds her floating out on the sea and picks her up in his ship, but what he does not know is that in order to be a siren again, Lira must bring Elian‘s heart to her mother.