Percy dreams of Daedalus imprisoned with his son after helping Theseus defeat the Minotaur and turning the king’s daughter against her father. The king forces Daedalus to keep inventing within the maze and threatens to punish Daedalus’s son if Daedalus refuses, leaving Daedalus to promise that he will find a way out.

The next morning, Chiron calls a war council in the sword arena. Annabeth, Clarisse, Chiron, and the others conclude that Luke knows about the Labyrinth entrance inside Camp Half-Blood and intends to use the maze to bypass the camp’s magical borders. Annabeth explains that Luke is searching for Daedalus’s workshop because Daedalus, if alive, or Ariadne’s string could let Luke navigate the Labyrinth safely and lead an army into camp and eventually toward Olympus.

Annabeth argues that someone must enter the Labyrinth before Luke reaches the workshop. Clarisse supports Annabeth as quest leader but refuses to go back into the maze, reacting with fear when Travis jokes about cowardice. Chiron sends Annabeth to consult the Oracle while Percy waits anxiously.

While Annabeth is gone, Juniper privately warns Percy that she also saw Quintus near the cave entrance around the time he arrived at camp, making Percy suspicious of the sword master. Percy then breaks rules by going to the Big House and discovers Clarisse secretly caring for Chris Rodriguez in the basement. Chris is mentally broken from the Labyrinth, hallucinates about darkness, skulls, and a terrifying “son of Poseidon,” and Clarisse’s tenderness reveals why she is so afraid to return.

Annabeth returns with a prophecy naming darkness, the endless maze, the dead, the traitor, the lost one, the ghost king, the child of Athena’s final stand, and a hero’s final breath. Annabeth hides or avoids the final line, but insists on leading the quest with Percy, Grover, and Tyson, even though Chiron warns that taking four questers breaks ancient law and may bring consequences.

As the quest is set for dawn, Quintus warns Percy that the Labyrinth distracts half-bloods and tells Percy to focus on what matters most. Quintus gives Percy a one-use Stygian ice dog whistle to summon Mrs O’Leary, deepening Percy’s unease because Luke once gave him a treacherous gift. Percy later finds Annabeth researching in the Athena cabin, where Annabeth admits fear over breaking the rules and risking her friends; Percy realizes she may be hiding a prophecy line about death and worries that one of them will not return.