The Adventure of the Red Widow is a short Sherlock Holmes

Sherlock Holmes

Sherlock Holmes is a fictional detective created by Scottish author and physician Sir Arthur Conan Doyle. The fantastic London-based "consulting detective", Holmes is famous for his astute logical reasoning, his ability to take almost any disguise, and his use of forensic science skills to solve...

 murder mystery by Adrian Conan Doyle

Adrian Conan Doyle

Adrian Malcolm Conan Doyle was the youngest son of Sir Arthur Conan Doyle and his second wife Jean, Lady Conan Doyle. He had two siblings, a sister, Jean, and a brother, Denis....

. The story was published in the 1954 collection, The Exploits of Sherlock Holmes

The Exploits of Sherlock Holmes

The Exploits of Sherlock Holmes is a short story collection written by Adrian Conan Doyle and John Dickson Carr, first published in 1954.The stories contained in the collection are:*"The Adventure of the Seven Clocks"*"The Adventure of the Gold Hunter"...

.

Holmes and Watson are invited by Scotland Yard

Scotland Yard

Scotland Yard is a metonym for the headquarters of the Metropolitan Police Service of London, UK. It derives from the location of the original Metropolitan Police headquarters at 4 Whitehall Place, which had a rear entrance on a street called Great Scotland Yard. The Scotland Yard entrance became...

 Inspector Gregson to accompany him to an ancient country mansion in Derbyshire

Derbyshire

Derbyshire is a county in the East Midlands of England. A substantial portion of the Peak District National Park lies within Derbyshire. The northern part of Derbyshire overlaps with the Pennines, a famous chain of hills and mountains. The county contains within its boundary of approx...

. The crime scene remains undisturbed, indicating that the lord of the manor

Lord of the Manor

The Lordship of a Manor is recognised today in England and Wales as a form of property and one of three elements of a manor that may exist separately or be combined and may be held in moieties...

 has been decapitated by the guillotine

Guillotine

The guillotine is a device used for carrying out :executions by decapitation. It consists of a tall upright frame from which an angled blade is suspended. This blade is raised with a rope and then allowed to drop, severing the head from the body...

in his own museum. His head and his cousin, Captain Lothian, are both missing, along with a horse from the stable. Holmes annoys a local police inspector named Dawlish by lingering over the crime scene, but quickly resolves the mystery.

"Most instructive," observed Holmes. "As I understand your theory, the two men engaged in a ferocious combat, being careful not to disarrange any furniture or smash the glass cases that clutter up the room. Then, having disposed of his opponent, the murderer rides into the night, a suit–case under one arm and his victim's head under the other. A truly remarkable performance."

An angry flush suffuse Dawlish's face."It's easy enough to pick holes in other people's ideas, Mr. Sherlock Holmes," he sneered. "Perhaps you will give us your theory."