Yajû shisubeshi: fukushû no mekanikku

When big-game hunter Tom Newcliffe invites a group of people to stay at his estate, they expect a relaxing weekend. Instead, they arrive to learn he thinks one of them is a werewolf and that no one can leave until that person is exposed. Among the suspects are a piano player and his girlfriend, an archaeologist, a diplomat and an artist, all of whom are subjected to a series of werewolf tests.