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Hazel cries and screams when the tunnel collapses until she notices Leo staring. Leo promises Frank will be fine, and Hazel knows they must continue. Gale the polecat joins them, and Hazel senses a presence. She hears a woman’s voice, and she and Leo magically move to the doorway of a cavern. Across the cavern, Leo and Hazel see the Doors of Death chained to the floor. The giant Clytius guards the Doors, and the sorceress Pasiphaë appears. The doors ding, and Pasiphaë reveals they have 12 minutes until Percy and Annabeth arrive. If someone doesn’t push the up button when they arrive, the Doors won’t open and they will disappear. Pasiphaë promises Percy and Annabeth can live if Hazel and Leo die because they need two demigods alive to be sacrificed to Gaea. The cavern dissolves into darkness.
Layers of Mist enfold Hazel and Leo into Pasiphaë’s new stone Labyrinth. Hazel knows it’s an illusion but doesn’t know how to break through. Hazel and Leo are forced to run and avoid the traps while Pasiphaë laughs. Hazel knows the only way to beat Pasiphaë is to make her see what she wants to see, which is a more dangerous maze. Hazel manipulates the Mist with her mind to turn the Labyrinth back to Pasiphaë. At a pit of snakes, Hazel and Leo jump. Hazel imagines a chute they fall through and land on top of Pasiphaë. The Labyrinth disappears. Hazel opens a trapdoor with the Mist under Pasiphaë.
The elevator door dings, and Leo throws a screwdriver at the button, so the Doors open. Percy and Annabeth fall onto the floor. Clytius motions Hazel and Leo to stop. Since Percy and Annabeth are unconscious, they will be easy to tie up for the sacrifice. Leo shoots flames at Clytius, but he absorbs them and chokes Leo. Hazel runs to help, but Gale warns her to stop. Behind Hazel, Hecate appears with torches in her hands saying Hazel has proven herself worthy.
Clytius taunts Hecate through Leo’s mouth and makes him contort in pain. Hazel manipulates the Mist, so Percy, Annabeth, and Leo appear at her feet. The Mist envelopes her friends and counteracts Clytius’s darkness. Leo wakes up, and Hazel tells him to stay in the Mist. Hazel screams at a taunting Clytius. Dozens of gems assault him, and he howls in pain but regroups quickly. Clytius tells Hazel Hecate will discard her while Hecate counters it is Hazel’s crossroads. Annabeth wakes and reminds Hazel of the chains on the Doors of Death she needs to cut. Hazel charges and slides under Clytius to stab him. She cuts one chain on the Doors, but before she can cut the other Clytius sends her flying. Leo screams Hazel’s name, and she staggers to her sword. Hazel looks at her helpless friends and throws her sword at the Doors. The other chain severs, and the Doors disappear. Jason, Nico, Piper, and Frank appear from a door in the Mist.
Jason, Leo, Frank, Piper, and Jason attack Clytius from every direction while Percy and Annabeth get to their feet. The demigods force Clytius to his knees and encircle him. Hecate steps forward and kills him. Hecate tells Hazel to lead the group to Athens to stop the giants and Gaea from waking. The House of Hades is unstable, and she disappears. The crew hugs Percy and Annabeth while Frank tends to Hazel. Piper explains that Frank summoned the spirits of dead warriors to lead them to help, but Frank can’t manage to call ghosts to help them now, so Hazel helps Nico shadow-travel them out of the temple. They appear on the hillside outside and exchange stories. Hazel is thrilled Frank was promoted to praetor. Percy and Annabeth aren’t ready to tell their story yet. Coach Hedge flies the Argo II over with Reyna at the railing.
Leo lowers the Athena Parthenos onto the hillside. Reyna is upset because she had to kill her gravely injured Pegasus. Annabeth invites Reyna to join them for their picnic lunch. Reyna accepts Frank as praetor but wonders if the legion will accept him since they both broke the laws of the legion in coming to the ancient lands. They try to figure out what to do with the Parthenos because a Roman leader must return it to the Greeks as a symbol of peace, but the crew needs to go to Athens and stop the giants. Nico offers to take Reyna and the statue via shadow-travel, and Reyna agrees if someone else comes. Frank volunteers Coach Hedge, who agrees to go. Percy thinks about the prophecy and wonders if they made the right decision, and Annabeth says they can’t control the prophecies and can only do what they think is best.
Percy finds Nico tying ropes to the Athena Parthenos and thanks him for leading the group to the House of Hades and for visiting Bob, who saved his and Annabeth’s life. Nico brushes him off, and Percy is hurt. Annabeth joins Percy and wishes Nico luck. Reyna and Coach Hedge come, and Nico shadow travels them out. The Argo II starts sailing for Athens. Percy stands on deck with Annabeth and tries not to think about Tartarus. They promise to defeat Gaea. The sky darkens, and Percy looks up at the stars and tells them Bob says hello.
In the climax, the final battle of the House of Hades, Hazel, whose POV begins the book, ends with realizing her potential and defeating Pasiphaë, cutting free the Doors of Death, and fighting Clytius long enough for her friends to arrive and help. Hazel is the lynchpin of the crew, and she proves herself worthy. The crew fights together in the end to defeat Clytius. Their individual journeys each lead them to this point, but their love for each other gave them the power they needed to succeed.
Hazel’s is a fitting POV to end the story on because she was secretly the most powerful of all the demigods and singlehandedly defeats Pasiphaë. Hecate was right in the beginning—without Hazel the rest of the characters would’ve died.
The final chapters offer the story’s resolution, where the crew gets to rest after the climactic battle. It also sets up the plot threads for the next novel. The crew survived the House of Hades but still must stop Gaea from rising and the war between the Greeks and Romans. Reyna, Coach Hedge, and Nico take the Athena Parthenos to Camp Half-Blood while the seven sail to Athens to fight giants. This split sets up the next book in the series where they will face Gaea at last.
The final section ends with Percy. He and Annabeth have made it out of Tartarus but are changed forever. Percy wants to forget about Tartarus but can’t. Bob’s sacrifice makes him vow to destroy Gaea.
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