For Beatrisa DeSouza, life as an undocumented immigrant in a small New England mill city is a daily struggle. But her challenges are raised to an entirely different level when she saves a young man from a savage beating. For this man has traveled through time to draw Beatrisa into a battle whose origins lie millions of years in the past, and which has secretly shaped the history of the city and the entire region. A terrible creature is trapped in the city, a creature who exists only to kill, and whose purpose is to destroy all life on Earth. It is about to escape, and Beatrisa learns that she is the only one who can stop it ...