Dimitri, a Russian sailor unknowingly brings the plague below.

Winterfest is a celebration of great importance to those who live below. This is Catherine's first Winterfest. But this year Winterfest is interrupted by Paracelsus.

A stress-aggravated illness triggers Vincent's collapse. Vincent goes far back through the catacombs of the tunnels to hide in a cave. While in there he continually growls and thrashes about as if he's gone mad. Catherine goes after him because she says that she can't stand to see him like that. After all he is the love of her life.