Ber's search for Serren comes to an end when he learns she's being kept prisoner at Snow White's castle. When he goes to retrieve her, he learns that she is suffering from a curse that has made her kill several Blue Beards. She is possessed by a Blue Siren, and the only way to save her is for the beast who rejected her to listen to the story of each her kills. But can Ber convince the siren to tell him her tales when it was his voice that drove her to kill?
To protect Serren from the pain of being abandoned by her beast, the sickness she locked up inside her has grown into a monster called the Blue Siren. A monster whose only purpose is to kill Blue Beards so the voice of the man who rejected her will be silenced by their screams.
When she is captured, she is taken to be quarantined at the formidable and inescapable prison at Snow White's castle. Content to die, she waits for the queen to decide her fate, but instead of an execution like she expects, a man who shares a voice with the one that drove her mad has come, demanding she tell him her story. But will he still love the beauty the siren is trying to protect when he learns just how insane she's become?