The story begins with the acquaintance: Dr. Watson, in search for houseroom in London, rents an apartment at Missis Hadson’s, straight arrow widow. Although he is totally fine with the accommodation, his neighbor leaves much to be desired – eccentric young man without any clear occupation makes Dr. Watson suspect he is a trespasser and a real criminal.

Soon Dr. Watson’s mistrust turns just the opposite when he discovers truly calling of his strange stable companion – private investigation. Mr. Sherlock Holmes is a serious threat for London underworld. Dr. Watson shortly gets involved into his new friend’s life full of exciting and dangerous adventures and becomes his loyal workmate.