Werewolf in a Raincoat

From: Juliette
Description: I finally found you, mon ami! It's horrible, completely horrible! I just met a werewolf wearing Detective's raincoat. I'm afraid our Detective has turned into a werewolf but he still remembers his human past. I know that if you shoot such a werewolf with a sliver bullet - before the next full moon - he will turn back into a human instead of dying. Detective has a pistol with silver bullets in his secret stash, but it won't open without five personal items of his. Hurry, find Detective's belonging. The full moon is tomorrow and without your help he'll stay a werewolf forever. Firstly, you need to take the raincoat from the werewolf. But be very careful, monsieur, I beg of you. Although Detective didn't turn completely into a monster, he might not recognize you.
Completed: Yes, it really is Detective's raincoat. Look there's my handkerchief in the pocket. I used it to bandage Detective's wounds after the recent skirmish with the werewolves. Oh, poor Detective!