The Valley of Fear

Other clues in the room include a bloody footprint on the windowsill, a missing dumb-bell, and the fact that the man’s wedding ring is missing. Another clue discovered soon after is a bicycle, concealed just outside the house grounds. Interrogation of the house servants reveals little, and after Mrs. Douglas, wife of the murdered man, and Cecil Barker, a friend of the family, are questioned, Holmes reveals to Watson that he believes the two are in a conspiracy together.