A TERRIFIED, INHUMAN scream stopped Percy in his tracks. “Brita!” He started to run toward the sound, all reason fleeing at the obvious sound of pain and terror. He wanted to call out to her that he was coming, but he forced himself to stay quiet and listen. He had to follow the sound to her. The underground passages were like a warren, tangled and confusing. He’d gotten himself so lost since entering the below ground space he didn’t think he could find the door he’d entered through. But that no longer mattered. First he had to find Brita. Then, together, they’d find a way out. The screaming stopped abruptly and in the sudden stillness the sound of his feet hitting the linoleum was all he heard. He passed dozens of metal doors with mesh-covered windows in them, glancing quickly through e

