A discharged revolver, a damning note, and a mysterious chip in a stone balustrade... Sherlock Holmes' remarkable powers of observation are challenged in this captivating mystery. When a former US senator, Neil Gibson, approaches Sherlock Holmes with a case that appears to have been solved, the consulting detective is convinced that things aren't all as they seem. Gibson's wife, Maria, is found dead on Thor Bridge with a bullet hole in her head and a note in her hand. The note appears to be from the family's governess, asking Maria to meet her at that spot. But despite a recently discharged revolver being found in the governess' wardrobe, Gibson is convinced that she isn't guilty. Holmes and Watson work together to unveil the truth. First published in 1922, 'The Problem of Thor Bridge' is an enthralling short crime story by Arthur Conan Doyle. This edition features a specially commissioned introduction.