I just had a good look at the knife you found and I found out if has a personal seal on it. It says MD on the botton of the hilt. There aren't many people in hawksmouth with those initials Name. There is no doubt about it; this knife belongs to Mugwum Delo who lives here in Hawksmouth. I want you to go and interrogate him. He lives in the west part of town, on the street leading to the Aldenvault tunnel. See if he has a plausible alibi. Report back here with your findings!