The Cardboard Box (E06)

Mary Cushing enlists Sherlock Holmes in investigating the disappearance of her sister, Susan. With her marriage to Jim no more, Mary finds love in Alec Fairburn, but with tragic consequences. Both Alec and Mary are murdered, their ears removed and bodies disposed of in a lake. With a friend of Mary's being framed for the killings, only Holmes knows who the real murderer is! (iTunes)