I'm afraid something's happened to Iz and his crew, so I'm going to Notre Dame. There's a priest there who might be able to help me figure out if the nest really is under Île de la Cité. Dr. Caulfield, if you haven't heard from us by tonight, send help.
"Though resistant to many elements, most werewolves have a weakness for silver, and in some cases ash (from the tree, not the fireplace). Generally speaking a kill-shot with a silver bullet, stake, or other weapon is enough to put down a werewolf; however, it should be noted that there is a human inside the creature. Therefore, disabling the beast (consider silver chains or a silver cage) is more beneficial--from a rehabilitation standpoint--than executing the individual."