Kel wakes on the beach beneath the red moon after surviving Conor throwing him from Marivent’s cliffs. The amulet Conor put around Kel’s neck has saved him from the Trick and the sea, but Kel knows the Castelguards will believe Kel dead. Unable to return to the Palace or safely go to the Black Mansion, Kel heads barefoot and salt-stiff into the Key, deciding to seek the one person whose truth remains unresolved.

Kel finds the abandoned warehouse where Prosper Beck’s revels once took place. Jerrod appears and admits he doubted Kel could escape the Trick. Kel refuses further evasions, says he knows who Beck really is, and demands to see the true Prosper Beck. Jerrod, realizing Kel has guessed Antonetta’s secret, brings Kel through the Maze to a former harbormaster’s house and warns Kel not to hurt Antonetta.

Inside, Kel confronts Antonetta Alleyne, who confirms she is Prosper Beck and that she gave Gremont’s amulet to Conor, trusting Conor’s love for Kel would make Conor use it to save him. Antonetta kisses Kel, but Kel stops her, insisting that not hating her does not erase her lies. Their argument exposes the depth of Kel’s hurt: Antonetta manipulated him, used false representatives as Beck, and let Kel suffer uncertainty over the locket, the Solstice Ball, and her hidden power in the Maze.

Kel lays out how he pieced together Antonetta’s identity: the Singing Monkey wine, her staged misdirection at the Roverge party, the tunnels under House Alleyne, Jerrod’s loyalty, the false meeting with Beck, and her knowledge of Kel’s debts. Antonetta counters that she became Beck to escape the small life and duties imposed on her on the Hill. She reveals there was once a real, minor criminal named Prosper Beck, but after his death she took his name and made it into a legend.

The confrontation shifts when Antonetta explains that her warnings at the Solstice Ball were meant to frighten Kel into stopping before he got himself killed, and that she wanted Gremont’s Charter for Kel so he could be free of being the Sword Catcher. Kel and Antonetta also confront their shared dishonesty: Kel hid being Kel Saren and the Sword Catcher, while Antonetta hid being Prosper Beck. They formally introduce themselves to each other by their true identities, acknowledging both the intimacy and mistrust between them.

Kel then reveals the real reason he came: Antonetta has weapons, influence, and ruthlessness that Castellane needs against the Malgasi. Kel asks Antonetta to work with the Black Mansion, Andreyen, and the others, not merely as Beck or as Antonetta but as both. Recognizing their common goal of stopping the Malgasi from destroying Castellane and the Hill, Antonetta agrees to listen to Kel’s plan.