The book "Apocalypse of the Alien God: Platonism and the Exile of Sethian Gnosticism" by Dylan M. Burns explores the history and philosophy of Gnosticism, focusing on the Sethian branch and its relationship to Platonism. Published by University of Pennsylvania Press in 2014, this textbook delves into the eschatology of this ancient religious movement. With a length of 344 pages, this hardcover book offers insights into the complex interplay between religious beliefs and philosophical ideas in the ancient world.