The year is 2023.

The world's power grids have been destroyed by a Carrington-level solar storm. Humanity is plunged into a new and savage dark age, pushed to the brink of extinction by famine, disease and social unrest, and preyed upon further by demonic forces.

Desperate survivors turn to a divided Catholic church in search of hope. On one side there is the church of Rome. On the other, a rival papacy set up in Avignon, France. Wishing to heal the schism, but fearing that a powerful evil has infiltrated the highest ranks of the Avignon leadership, Rome sends a lone representative to assess the situation in France.

And also to cut down any heretics he finds along the way.

Exorcist Ossian McGregor, armed with the holy sword Grand Inquisitor, sets out to Avignon on a crusade with the intention to follow the stream of demonic activity to its fountainhead.

But the evil he finds far exceeds even his wildest imaginings.

The year is 2023. Welcome to Hell on Earth.