I'm trying to remember an Agatha Christie title.?

you can choose:

Novels

1920 The Mysterious Affair at Styles (introducing Hercule Poirot, Chief Inspector Japp and Captain Hastings)

1922 The Secret Adversary (introducing Tommy and Tuppence)

1923 Murder on the Links

1924 The Man in the Brown Suit

1925 The Secret of Chimneys

1926 The Murder of Roger Ackroyd

1927 The Big Four

1928 The Mystery of the Blue Train

1929 The Seven Dials Mystery

1930 The Murder at the Vicarage (introducing Jane Marple)

1931 The Sittaford Mystery (also known as Murder at Hazelmore)

1932 Peril at End House

1933 Lord Edgware Dies (also known as Thirteen at Dinner)

1934 Murder on the Orient Express

1934 Why Didn't They Ask Evans? (also known as The Boomerang Clue)

1935 Three Act Tragedy (also known as Murder in Three Acts)

1935 Death in the Clouds (also known as Death in the Air)

1936 The A.B.C. Murders (also known as The Alphabet Murders)

1936 Murder in Mesopotamia

1936 Cards on the Table

1937 Death on the Nile

1937 Dumb Witness (also known as Poirot Loses a Client and Mystery at Littlegreen House and Murder at Littlegreen House)

1938 Appointment with Death

1938 Hercule Poirot's Christmas (also known as Murder for Christmas and A Holiday for Murder)

1939 And Then There Were None (also known as Ten Little Indians and originally as Ten Little *******)

1939 Murder is Easy (also known as Easy to Kill)

1940 Sad Cypress

1940 One, Two, Buckle My Shoe (also known as An Overdose of Death and The Patriotic Murders)

1941 Evil Under the Sun

1941 N or M?

1942 The Body in the Library

1942 Five Little Pigs (also known as Murder in Retrospect)

1942 The Moving Finger (also known as The Case of the Moving Finger)

1944 Towards Zero (also known as Come and Be Hanged)

1944 Death Comes as the End

1945 Sparkling Cyanide (also known as Remembered Death)

1946 The Hollow (also known as Murder After Hours)

1948 Taken at the Flood (also known as There is a Tide)

1949 Crooked House

1950 A Murder is Announced

1951 They Came to Baghdad

1952 Mrs McGinty's Dead (also known as Blood Will Tell)

1952 They Do It with Mirrors (also known as Murder with Mirrors)

1953 A Pocket Full of Rye

1953 After the Funeral (also known as Funerals are Fatal and Murder at the Gallop)

1954 Destination Unknown (also known as So Many Steps to Death)

1955 Hickory Dickory Dock (also known as Hickory Dickory Death)

1956 Dead Man's Folly

1957 4.50 From Paddington (also known as What Mrs. McGillycuddy Saw and Murder She Said)

1958 Ordeal by Innocence

1959 Cat Among the Pigeons

1961 The Pale Horse

1962 The Mirror Crack'd from Side to Side (also known as The Mirror Crack'd)

1963 The Clocks

1964 A Caribbean Mystery

1965 At Bertram's Hotel

1966 Third Girl

1967 Endless Night

1968 By the Pricking of My Thumbs

1969 Hallowe'en Party

1970 Passenger to Frankfurt

1971 Nemesis

1972 Elephants Can Remember

1973 Akhnaton - A play in three acts

1973 Postern of Fate (final Tommy and Tuppence, last novel Christie wrote)

1975 Curtain (Poirot's last case, written four decades earlier)

1976 Sleeping Murder (Miss Marple's last case, written four decades earlier)

http://www.agathachristie.com/