The Adventure of the Beryl Coronet characters

Appears from the start

A consulting detective in London whose close attention to physical traces lets him reconsider a case that appears settled. When a distressed banker arrives at Baker Street, Holmes listens for the assumptions hidden inside his account and then examines the family home himself.

Appears from the start

Holmes's friend and the narrator of the case. Watson is present when Alexander Holder seeks help and accompanies Holmes as the detective investigates the damaged coronet and the people around it.

Appears from the start

A senior London banker entrusted with a priceless royal coronet as security for a large loan. Afraid to leave it at the bank, he takes it to his suburban home, where its damage and the disappearance of three beryls threaten his reputation as well as his household.

Appears from the start

Alexander Holder's only son, a young man whose gambling and expensive habits have strained his father's trust. His request for more money is refused shortly before the coronet is damaged, making his conduct an immediate focus of suspicion.

Appears from the start

Holder's orphaned niece, who has grown up in his home and manages the household with composure. He regards her with deep affection and has hoped she might marry Arthur, though she has declined him.

Appears from the start

A fashionable aristocrat and companion of Arthur whose charm conceals a dangerous reputation. Holder distrusts his influence, while Mary has encountered him through the family's social circle.

Appears from the start

A recently hired maid in Holder's household. Her habit of meeting a suitor near the house at night creates one possible explanation for activity around the windows on the evening of the theft.