Quiet bachelor life is not as Dr. Watson imagines once he discovers his flat-mate Sherlock Holmes is a consulting detective. Accompanying Holmes to an ill-omened house in south London, Watson is startled to find a dead man whose face is contorted in horror. With no signs of struggle, but a strange word scrawled in blood as the only clue, Dr. Watson is as baffled as the police - but Holmes's brilliant analytical skills soon uncover a trail of murder, revenge and lost love...