Wave (Four Regions #2)

Dirge never felt at home in the Seas—her family made sure of that. A half-breed in a siren shoal where purity and beauty reign, she was a failure from birth. When her mother sends her on a mission for vengeance, she must trade her tail for legs and carry out a murder. If she succeeds, she will earn power and prominence among her kind. If she fails, her demon father will pay the price.
When she arrives in a new region, she finds more than the darkness and evil she had come to expect.
She finds power.
She finds support.
She finds a home.
But Dirge must hide the secret of what she truly is and why she is in the region, lest her plan is foiled and her mother follows through on her threat to destroy everything Dirge holds dear.