A map to all corners of the world, and-if they're right-the next. A year later, what happened in the caves at Eden's edge still haunts Dexter and Daphna's nightmares: falling through the darkness, the stench, the flapping wings-that maniacal laughter. Back in Portland, they've built a new life with their new mother, but now, the night before they were officially to open a new chapter in their lives, they learn the awful truth: When they came back from those dreadful caves, something came with them-something older than time and capable of unleashing a devastating plague. Once again, the twins are on the run, not only from the terrifying creature, but also from the authorities who think Dex and Daphna have answers-and from other powerful interests who want to know what information they possess. Their newest secret, a book of miraculous maps, is their best hope of survival. If they can solve its mysteries, it might lead them beyond their nightmares-and perhaps even beyond their wildest dreams.