Tidal by Amanda Hocking is the third book in the Watersong series. Gemma, a siren cursed by an ancient song, struggles to break free from her fate while dealing with the dangers of her new existence. As she searches for a way to escape the siren’s grasp, her loved ones—Harper, Daniel, and Alex—race against time to help her. Meanwhile, the other sirens grow more dangerous, forcing Gemma to make difficult choices that could change everything.