Sherlock Holmes and The Fallen Photographer

An attack in February, 1902, upon Henry Bamford, an eminent forensic photographer, brings him to seek out Holmes' help, However, even as Holmes is considering the case, Bamford is cruelly murdered. Holmes feels a measure of guilt from his inaction and is joined in finding the killer by Bamford's house guest, a young Frenchman, Edmond Locard. Locard is an aspiring criminologist and It is he that proposes his new, and intriguing, 'contact' theory.
Examining the evidence together, it is the fal...