Science Fiction || In the last years of the Forerunner empire, chaos rules. The Flooda horrifying shape-changing parasitehas arrived in force, aided by unexpected allies. Internal strife within the ecumene has desperately weakened Forerunner defenses. Only the Ur-Didact and the Librarianhusband and wife pushed into desperate conflicthold the keys to salvation. Facing the consequences of a mythic tragedy, one of them must now commit the greatest atrocity of all timeto prevent an unmatched evil from dominating the entire universe.