The Collapse. After a technological attack destroys the United States, the world is thrust into chaos. Omega - a shadow army arisen from the ashes - invades. Based on the Collapse Series by #1 Bestselling Author Summer Lane, this book is a guide to the world of Cassidy Hart and her friends from the post-apocalyptic battleground of California. Explore designs from 20 of the most popular characters from the series. Enjoy concept art and three exclusive short stories from Chris Young, Sophia Rodriguez and Harry Lydell.