The Offer

It's the Halloween break. Daisy and Hazel are staying in London with Uncle Felix and Aunt Lucy when all of a sudden they are asked to go to a Halloween Party to find a murderer with no murder to base anything off of. Seeing some familiar faces, everything seems to be going well. Until it's not. Having lost one of their friends with no clue as to where they went , will they be able to solve one of the hardest cases they've came across, or will the murderer strike again?