翡翠面具

     Eccentric scientist Harper lives in a spooky mansion with all the trimmings: hidden lab, secret panels, inscrutable butler, and greedy relatives with unusual talents       When Harper seems to be murdered, Charlie Chan (with the uninvited help of No       4 son) tries to answer such questions as Where's the body? How can a dead man walk? And how can a secret murder be done in full view o