Temporal vortices can destroy the entire future: Conquistador Don Luis Ildefonso Castelar y Moreno captured Wanda Tamberly on September 10, 1987. On May 11, 2937 BC, he had already captured Stephen Tamberly, an agent of the Time Patrol. Don Luis will stop at nothing to correct the history of his 16th century! The exaltationists from the thirty-first millennium, led by Mero Varagan, also want to change history. Once again, only Mance Everard can save the familiar world...