From the back cover:
Put in your sickle and reap, for the hour to reap has come.
Or has it? The forces of darkness are trying to bring on Armageddon, but nothing is quite as it seems. Some infernals are opposing it, and some angels are helping it along. It's time to choose sides for the biggest fight since the Fall, and no one knows who will win, or even if the time is right.
The Final Trumpet is the conclusion to the five-part Revelations Cycle for the In Nomine roleplaying game. It contains expanded Superior write-ups for Michael, Baal, Kobal, and Malphas, and introduces two new Superiors: Khalid, Archangel of Faith, and Magog, the Demon Prince of Cruelty. Also included is "The Final Trumpet," the biggest In Nomine adventure ever published.