There was an ongoing case which you were working on, trying to find a murderer.

A murder would happen every Halloween at a certain time. This man...he wore a mask and walked around as if he was only dressed up for Halloween. You were walking the streets on Halloween night as you met eyes with a man, wearing a mask. He turned his head slowly as he looked at you.

"Hm." He looked away. You had a weird vibe about him which sent shivers down your spine.