The forbidden Citadel at the heart of the ancient city of Ruin opens its gates for the first time in history. Why now, after centuries of secrecy? A deadly disease has erupted within and perhaps infected charity worker Gabriel Mann may hold the cure. Meanwhile without Gabriel, former journalist Liv Adamsen is vulnerable in the desert oasis that is her new home. And in the USA, newly qualified FBI Agent Joe Shepherd is investigating the disappearance of NASA’s most senior professor. For them all something big is coming. Something that will change everything. But will it be a new beginning or the End of Days? The final book in the trilogy.