When Maria Gibson is shot through the head while standing on the Thor Bridge on her estate, the family's governess, Grace Dunbar, is arrested for murder. Not only does she admit meeting her mistress on the bridge, the police find the murder weapon in her room. She vehemently denies killing the woman and Senator J. Neil Gibson, the dead woman's husband, believes her. He hires Sherlock Holmes to get to the bottom of it all. The Senator admits that he and Miss Dunbar have affections for one another but that neither of them had anything to do with the murder. Dr. Watson is convinced that the Senator is the culprit but Holmes comes to an entirely different conclusion. Written by
Did You Know?
Holmes finds a picture of a South American landscape on a mantlepiece and says "See those unscalable cliffs which time and the foot of man have never touched, where monsters from the dawn of history might still roam". This is a reference to The Lost World, Holmes creator Arthur Conan Doyle's 1912 adventure novel, set in an unexplored plateau hidden in the Amazon jungle where dinosaurs still live. See more
Watson's revolver, which plays a pivotal role in the solution of the mystery, is once again a Webley Mk IV .455, a revolver not fielded by the British army until 1915, some years after the story is set. See more
I'm falling into your involved habit of telling a story backward.