<p>On a sunny September morning, the creatures first appear. Shur sees one of them hovering outside the window in history class: it looks like a giant butterfly, at first too beautiful and strange to seem like a threat. But when emergency alerts light up everyone''s phones around her, she realizes something very, very wrong is happening outside. These... <i>things</i> are everywhere.<br><br>By the time Shur makes it back to her house with her brother, Keene, and their two best friends, it''s clear they must face whatever comes next on their own. A terrifying species the world''s never seen before has suddenly emerged, and few living things are safe. As the creatures swarm and attack outside, life for Shur and her friends becomes a survival game. They board the windows, stockpile supplies, and try to make sense of the news reports for as long as the power stays on.<br><br>Yet nothing can prepare them for what follows. The butterflies are only the beginning. The next onslaught will be de