Nigella Mason
Season(s) 2
Portrayed by Olivia d'Abo
First seen The Marchioness
Last seen The Marchioness
Episode count 1
Status Alive
Gender Female
Significant other(s) Mycroft Holmes (ex-fiancé)
Nationality British

Nigella Mason, Marchioness of Loudwater, is the ex-fiancé of Mycroft Holmes and a British peeress.


Nigella Mason is Mycroft Holmes ex-fiancé and the Marchioness of Loudwater. Mycroft's brother, Sherlock Holmes, suspected she was only interested in Mycroft for his wealth, and so successfully seduced her to prove it.[1] She retains the title of Marchioness of Loudwater, following her marriage to The Most Honourable Lord Loudwater, Robert Suffolk, The Marquess of Loudwater. She came out of her marriage to Lord Loudwater with her title of Marchioness of Loudwater and ownership of one of Lord Loudwater's horses, a champion stallion, Silver Blaze. 10 weeks after her divorce from Lord Loudwater, Silver Blaze died of heart failure, so she did with Silver Blaze's brother what she had intended to do with Silver Blaze. She made him a stud and herself a horse pimp. In this scam, of passing of Silver Blaze's brother as Silver Blaze himself she got involved with the Robles cartel, specifically a man by the name of Joaquim Aguilar and when they discovered that it was a scam, they almost killed her. With the help of Mycroft, Sherlock and Joan Watson she escaped unharmed. She was then instructed by Mycroft to repay all the victims of her scam and use the money the Joaquim Aguilar had given her to begin a 'more respectable start in life', with the repayments overseen by both Sherlock and Mycroft.[2]


Season two appearances
Step Nine Solve for X We Are Everyone Poison Pen
Ancient History An Unnatural Arrangement The Marchioness Blood Is Thicker
On the Line Tremors Internal Audit The Diabolical Kind
All in the Family Dead Clade Walking Corpse de Ballet The One Percent Solution
Ears to You The Hound Of Cancer Cells The Many Mouths of Aaron Colville No Lack of Void
The Man With the Twisted Lip Paint It Black Art in the Blood The Grand Experiment


  1. "Step Nine," aired September 26, 2013. Elementary, Season 2, Episode 1. CBS. Directed by John Polson, written by Robert Doherty and Craig Sweeny.
  2. "The Marchioness," aired November 7, 2013. Elementary, Season 2, Episode 7. CBS. Directed by Sanaa Hamri, written by Christopher Hollier and Craig Sweeny.

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