"The Left Behind Series" is a collection of 16 novels written by authors Tim LaHaye and Jerry B. Jenkins. The series focuses on the events following the Rapture, a biblical event where Christians are taken to heaven, leaving behind those who are not saved. The story follows a group of characters as they navigate a world filled with chaos, conflict, and the rise of the Antichrist. The series explores themes of faith, redemption, and the struggle between good and evil. It has gained a significant following and has been adapted into films and graphic novels, contributing to its popularity in Christian fiction.