Thanks for sending me your save file, Mave. I took a look at it for you.
You haven't yet attached the rope to the hook that's hanging from the ceiling directly above the Wolfman's cage. Look up high -- you can't miss it. If it's still difficult to see, perhaps change to first person view instead of third. (The R key on your keyboard switches viewpoints.) Have the rope in your inventory ready, and click it on the hook. Holmes will then say that the trap is set.
