Harriet MacLeod (aka 'Harry'):
Harry wedges the the secret room's door open before searching for the mechanism which allows the door to be opened from the inside. She also searches the room for anything which might have been left behind by its most recent occupant(s).
14:58, Today: Harriet MacLeod (aka 'Harry') rolled 2 using 1d20. Check Vs. WIS 13.
There's nothing left behind of any interest.
Except sort of... Harry does find that there's a stone on a hinge that swings out. Underneath is a switch or latch or whatever one would call it that makes a click at the door when pushed.
So... maybe... he let himself out, as a human. Surely the werewolf couldn't have stumbled upon it and also activated it?
...Or was the truth more complicated? Did someone come, open the door from the outside, and then they were grabbed, thrown in, trapped inside, the werewolf ran off, the person knew the secret of how to open the door, they let themselves out...?
Or something else...?
There's just no way to tell.
There's no drops nor spatters of blood on the ground, though, at least...