The year is 1896. Doctor Watson is invited to the Dorsetshire coast by an old friend. To Watson's surprise he manages to persuade his good friend, Mr. Sherlock Holmes, to accompany him. This hitherto unknown tale of Watson's involves romancing, dancing, and occasional glasses of cider, but the holiday turns into a nightmare as the two old friends encounter an unimaginable evil which threatens their very souls. Can they triumph?