Detective Conan

The Murder Case of Man In Bandages at the Mountain Villa (1) (2x6)

:

Conan and Ran go to a mountain house were they meet Sonoko and her Sister and some of her friends. During the night at dinner they see a man wrapped in bandages swinging away with one of Sonoko's friends. Later they find the friend dead in the woods the telephone line cut and the bridge cut. Who is this mystery man?