In 1958 there was a massacre. A demon had infiltrated the Men of Letters and had killed all those who stood by for the initiation of Josie Sands and Henry Winchester. Henry survived by slipping through time and the demon followed, leaving behind the shell-shocked remains of the organization.
The bunker in Lebanon, Kansas, was not the only base of operations for them. There was a second one located in northern Pennsylvania and that became the base of their operations. Their goal now was not just to study, and not even just to hunt, but to eradicate. To develop a way to prevent monsters and angels and demons from coming to earth to harm innocents. And through this the Rossum Corporation was born.
But not everyone in Rossum is a purehearted philanthropist who simply wants the best for the world.