Annabeth leads Percy, Grover, and Tyson into the Labyrinth, but the group becomes lost almost immediately. Annabeth tries to follow the left wall, only for the maze to shift into a circular chamber with eight identical exits, forcing Annabeth to guess a route despite her claim of deductive reasoning.

The tunnels keep changing in age and style, moving from brick sewer passages to Roman mosaics, cement corridors, air shafts, wine cellars, and spaces beneath what sounds like a bar. Annabeth explains that the Labyrinth is a living patchwork of architecture that expands by adding pieces, and she believes older areas may lead toward Daedalus’s workshop.

The group finds the skeleton of a milkman who apparently wandered into the maze and died trying to escape. Grover and Tyson smell monsters nearby, heightening the danger, but Annabeth insists they must go deeper to reach the center. After more wandering, the group returns to the Roman fountain room, where the exit behind them has vanished.

In the room, Janus, the two-faced god of doorways, beginnings, endings, and choices, blocks two locked doors and forces Annabeth to choose between them. Janus suggests one door may lead where Annabeth wants to go and the other to death, while also probing Annabeth’s fear of indecision and warning that a future choice could kill Annabeth and her friends.

Before Annabeth can choose, Hera appears in a burst of light and drives Janus away, saying Annabeth’s time has not yet come. Hera feeds the group, explains that some minor gods may be losing faith in Olympus and turning toward Kronos, and says her goal is to keep the Olympian family together. Hera advises Annabeth to seek Hephaestus, who may know Daedalus’s fate, and says they will likely have to pass through a ranch.

Annabeth uses Hera’s granted wish to ask for a way to navigate the Labyrinth, but Hera says the means is already within their grasp and that Percy knows the answer, though Percy does not understand. Hera warns Annabeth that the postponed choice will return, then disappears along with the food. When Grover and Tyson sense something large approaching from the right corridor, the group chooses the left path and plunges onward.