Mysterious Family Coats of Arms

From: Detective
Description: So, all the men behind the mirror were rich and distinguished. In addition, they all died shortly after they were married. Interesting, don't you think? I noticed a jewellery box that had the same coat of arms as the ghosts. But the box is closed, and it doesn't have a keyhole. It seems to be closed with a powerful magic spell. The Mistress is hiding a secret inside. Look for City artifacts to open the box, I'm sure you'll find the missing information needed to shed some light on the connection between the Mistress and the missing noblemen.
Completed: Look, there's a marriage certificate inside the box. Unbelievable! Every one of these rich aristocrats was married to the Mistress! There's even a newspaper clipping here, look what it says.