A subway slasher that kills with claws and leaves the victims looking as if they were mauled by a bear is on the prowl. When Catherine finds out about the case she starts to suspect Vincent, as she remembers how he rescued her from the attackers in the safe house.

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.