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By the Pricking of my Thumbs First Edition Cover 1968

Dust-jacket illustration of the first UK edition, designed by Kenneth Farnhill

By the Pricking of My Thumbs is a work of detective fiction by Agatha Christie and first published in the UK by the Collins Crime Club in November 1968 and in the US by Dodd, Mead and Company in December the same year.[1] The UK edition retailed at twenty-one shillings (21/-) and the US edition at $4.95. It features her detectives Tommy and Tuppence Beresford.

Youthful in two Christie books written in the 1920s, middle-aged in a World War II spy novel, Tommy and Tuppence were unusual in that they aged according to real time, unlike Hercule Poirot or Miss Marple, whose age remained more or less the same from their first novels in the 1920s, to their last novels in the 1970s.

The title of the book comes from Act 4, Scene 1 of William Shakespeare's Macbeth, when the second witch says:

By the pricking of my thumbs,
Something wicked this way comes.


While visiting a retirement home, one of the residents, Mrs Lancaster, asks Tuppence unexpectedly: 'Was it your poor child? There behind the fireplace.' Tuppence is intrigued and all the more when the old lady is taken out of the home not long after. Tommy and Tuppence set out to investigate.

Plot summary[]

(may contain spoilers - click on expand to read)

The novel is divided into four books.

In Book 1 Tommy and Tuppence Beresford visit Tommy’s aunt Ada in a retirement home called Sunny Ridge. While Tommy talks with his aunt, Tuppence has a conversation with another resident, Mrs Lancaster, who unexpectedly says 'Was it your poor child? There behind the fireplace.'

A few weeks later Aunt Ada dies of natural causes. When they return to the home after the funeral to make arrangements for Ada’s possessions, they find that Mrs Lancaster has suddenly departed. The matron tells them that a relative called Mrs Johnson took her away. Tuppence suspects there’s more to it and tries to find the relative but the trail turns cold. One of the items Aunt Ada had left is a painting of a house by a river. The picture strongly reminds Tuppence of a house she once saw and immediately liked. The painting was supposedly given to Aunt Ada by Mrs Lancaster.

In Book 2 Tommy is away for a few days, so Tuppence starts looking for the mystery house on her own. Eventually she finds it in a small village called Sutton Chancellor. It turns out that the house is divided in a peculiar way. The back part of the house is rented by a middle-aged couple called the Perrys. The front part has been vacant for years. Tuppence meets with the people of Sutton Chancellor. There is an elderly vicar, a talkative B&B landlady called Mrs Copleigh, and a Miss Bligh who seems to run the parish.

Under the pretence of house hunting, Tuppence tries to get more information about the house. Mrs. Copleigh tells her a grim story about a spate of child killings some years ago. Then Tuppence fails to return home on the arranged day, having been concussed by a blow to the head.

In Book 3 Tommy and his servant Albert are worried about Tuppence. Tommy does some investigation on his own. He discovers the painting was by an artist called Boscowan who died several years ago. Tommy meets with the doctor of Sunny Ridge. There have been some deaths that the doctor finds odd and he is worried about possible foul play. Tommy then talks to an investigator friend who hints the house in Sutton Chancellor might have been used as a safe house for a criminal gang. Tommy shows the painting to Mrs Boscowan, who notes that someone has added a boat to the picture. At home, Tommy learns that Tuppence is in a hospital near Sutton Chancellor with severe concussion. Tommy and Albert then find a hidden letter from Aunt Ada, in which she suspects there is malice in Sunny Ridge.

In Book 4 Tuppence has recovered. An old doll she found in the mysterious house turns out to contain uncut diamonds. A party is arranged in Sutton Chancellor. Sir Philip Starke, the local landowner, and Mrs Boscowan are invited. Tuppence has the impression that Sir Phillip knows more about the whole affair. The next day Tuppence goes to the vicarage and confronts Miss Bligh, who she suspects was the one who hit her on the head.

Alone, Tuppence goes to the mystery house and to her surprise finds the missing Mrs Lancaster. She takes Tuppence to a secret part of the house and proceeds to tell her life story. She was a wild child, a dancer, who got pregnant young. After she chose to abort the baby (“I was a dancer, I didn’t want a child... the doctor said it would be all right, but it wasn’t all right”), she took up with a criminal gang; they used the house to hide their loot. Later she left that life behind and got married, hoping to have a family, but could not conceive again and in her grief and guilt over the abortion became unhinged and started killing children. “The only way to atone for the first murder was more murders— they were sacrifices, see?”

One of the other residents, Mrs Moody, in Sunny Ridge had recognised her, so she had to be silenced. Miss Bligh, posing as a relative, resettled her into a new home. After her candour, Mrs Lancaster attempts to kill Tuppence, first with poisoned milk, then with a metal blade.

Tuppence is saved just in time. It is revealed that Mrs Lancaster is actually the wife of Sir Phillip Starke. He had covered up her insanity and the crimes she committed. He was assisted in the cover-up by Miss Bligh, his former secretary and confidante. Tommy and Tuppence then return home.


At Sunny Ridge[]

In Sutton Chancellor[]



Literary significance and reception[]

The novel is dedicated "to the many readers in this and other countries who write to me asking: 'What has happened to Tommy and Tuppence? What are they doing now?'"

Francis Iles (Anthony Berkeley Cox) in The Guardian's issue of 13 December 1968 admitted that, "This is a thriller, not a detective story, and needless to say an ingenious and exciting one; but anyone can write a thriller (well, almost anyone), whereas a genuine Agatha Christie could be written by one person only."

Maurice Richardson in The Observer of 17 November 1968 said, "Not her best though it has patches of her cosy euphoria and aura of the sinister."

Robert Barnard: "Begins rather well, with a vicious old aunt of Tommy's in a genteel old people's home, but declines rapidly into a welter of half-realised plots and a plethora of those conversations, all too familiar in late Christie, which meander on through irrelevancies, repetitions and inconsequentialities to end nowhere (as if she had sat at the feet of Samuel Beckett). Makes one appreciate the economy of dialogue – all point, or at least possible point, in early Christie."

Film, TV or theatrical adaptations[]

Mon petit doigt m'a dit...[]

In 2005, the novel was adaptated by the French director Pascal Thomas under the title Mon petit doigt m'a dit.... The setting is changed to France in about 2003 but the plot is fairly faithful to the original.

Agatha Christie's Marple[]

In 2006 ITV adapted the novel for episode three of Series Two of their series Agatha Christie's Marple starring Geraldine McEwan. Tommy was played by Anthony Andrews and Tuppence by Greta Scacchi. The plot was altered with Tommy away on military intelligence business abroad, and Tommy's part of the story was re-written for Miss Marple. Tommy was portrayed as a self-important strong male, whilst Tuppence was portrayed as a maudlin alcoholic who carried a hip flask and who was resentful of her husband's success; she too was going to be signed-up by MI6 but who had then not been able to fulfil this ambition as she was pregnant with their first child.

Publication history[]

The novel was also carried in the Cosmopolitan, vol. 167 no. 1, July 1969 in an abridged form.

International titles[]

  • Czech: Dům u kanálu (The Canal House)
  • German: Lauter reizende alte Damen (Lots of Charming Old Ladies)
  • Italian: Sento i pollici che prudono (I Feel Itchy Thumbs)
  • French: Mon petit doigt m'a dit (My Little Finger Told Me)
  • Swedish: Ett sting i tummen (A Sting in the Thumb)

Worldwide Covers[]


  1. Chicago Tribune 01 Dec 1968 carries an advertisement for the book and states: "Just arrived at all bookstores".
Hercule Poirot novels The Mysterious Affair at Styles - The Murder on the Links - The Murder of Roger Ackroyd - The Big Four - The Mystery of the Blue Train -Peril at End House - Lord Edgware Dies - Murder on the Orient Express - Three Act Tragedy - Death in the Clouds - The A.B.C. Murders - Murder in Mesopotamia - Cards on the Table - Dumb Witness - Death on the Nile - Appointment with Death - Hercule Poirot's Christmas - Sad Cypress - One, Two, Buckle My Shoe - Evil Under the Sun - Five Little Pigs - The Hollow - Taken at the Flood - Mrs McGinty's Dead - After the Funeral - Hickory Dickory Dock - Dead Man's Folly - Cat Among the Pigeons - The Clocks - Third Girl - Hallowe'en Party - Elephants Can Remember - Curtain
Miss Marple novels The Murder at the Vicarage - The Body in the Library - The Moving Finger - A Murder is Announced - They do it with Mirrors - A Pocket Full of Rye - 4.50 from Paddington - The Mirror Crack'd from Side to Side - A Caribbean Mystery - At Bertram's Hotel - Nemesis - Sleeping Murder
Tommy and Tuppence novels The Secret Adversary - N or M? - By the Pricking of My Thumbs - Postern of Fate
Superintendent Battle novels The Secret of Chimneys - The Seven Dials Mystery - Cards on the Table - Murder is Easy - Towards Zero
Colonel Race novels The Man in the Brown Suit - Cards on the Table - Death on the Nile - Sparkling Cyanide
Other novels The Sittaford Mystery - Why Didn't They Ask Evans? - And Then There Were None - Death Comes as the End - Sparkling Cyanide - Crooked House - They Came to Baghdad - Destination Unknown - The Pale Horse - Endless Night - Passenger to Frankfurt
Published as Mary Westmacott Giant's Bread - Unfinished Portrait - Absent in the Spring - The Rose and the Yew Tree - A Daughter's a Daughter - The Burden