In December, six months after the Sea of Monsters adventure, Percy Jackson, Thalia Grace and Annabeth Chase go to Westover Hall to meet Grover Underwood, who had found two powerful demigod siblings there, Bianca and Nico di Angelo. Thalia displays the ability to manipulate the Mist and tries to convince a resident teacher and the vice-principal there that the three belong to the school. The teacher is easily tricked but the vice-principal, who was actually a manticore in disguise wasn't tricked. Thalia manages to not let the three get kicked out before they could find Grover.
