When the hot call comes over the radio: "Code Red! Active shooter at Carlisle Elementary School," Police Sergeant Jack Carpenter has one job and only one job. Find the gunman; take him out. He rushes into the school, fully armed and focused on cold, hard reality. But what happens to him in the next few hours shatters the world as he has always known it. And in the next three days, everything Jack Carpenter believes about himself, about life and reality, about good and evil and the whole nature of the universe will be challenged.Can it possibly be true—seriously?—that invisible monsters prowl among us every day?That there exists in the real world a winged creature more horrifying than any Hollywood-animated, computer-generated, mechanical unreality?And that the single-minded mission of that beast—a creation of absolute, soul-less evil—is to kill Jack Carpenter?That's crazy! Fairy-tale-science-fiction-horror-movie-bogeyman crap!Bottom line: it flat-out cannot possibly be true.But it is.