Miscarriages of justice
He wrote several books that questioned convictions in a number of notable cases in British judicial history. One of the first miscarriages of justice he investigated was the conviction and hanging of Timothy Evans in his 1961 book Ten Rillington Place (ISBN 978-0-586-03428-6). Evans was convicted of murdering his baby daughter in 1950, but Kennedy contended that he was innocent and that the murders of his wife and baby had been committed by the serial killer John Christie. Christie was hanged three years after the hanging of Evans, following the discovery of six more bodies at 10 Rillington Place, none of which could be ascribed to Evans. Indeed two of the skeletons found at the house dated back to the war – long before Evans and his family had moved in. After a long campaign Evans was posthumously pardoned in 1966. The scandal helped in the abolition of the death penalty in the UK. In 1970 Kennedy's book was turned into a film entitled 10 Rillington Place; the British crime film starred Richard Attenborough as Christie, John Hurt as Timothy Evans, Judy Geeson as Beryl Evans and Pat Heywood as Ethel Christie.
In 1985 Kennedy published The Airman and the Carpenter (ISBN 978-0-670-80606-5), in which he argued that Richard Hauptmann did not kidnap and murder Charles Lindbergh's baby, a crime for which he was executed in 1936. The book was made into a 1996 HBO film Crime of the Century, starring Stephen Rea and Isabella Rossellini. In 1990 Kennedy became the advisory committee chairman of Just Television, a television production company dedicated to exposing miscarriages of justice. In 2003 he wrote 36 Murders and 2 Immoral Earnings (ISBN 978-1-86197-457-0), in which he analysed a number of noted cases, including the Evans case and those of Derek Bentley and the Birmingham Six, a number of which were affected by claims of police failure, police misconduct or perjury. In it he concluded that the adversarial system of justice in the UK and the United States "is an invitation to the police to commit perjury, which they frequently do", and said that he preferred the inquisitorial system.
Kennedy also wrote,
Sub-Lieutenant: A Personal Record of the War at Sea, 1942
Nelson's Band of Brothers, 1951, (US edition Nelson's Captains, 1952)
revised as Nelson and His Captains, 1975, ISBN 0-00-211569-7, reprinted 2001 ISBN 978-0-14-139090-1
One Man's Meat, 1953
Murder Story, 1954
Trial of Stephen Ward, 1964, ISBN 978-0-575-01035-2
Very lovely people; a personal look at some Americans living abroad, 1969 ISBN 978-0-671-20205-7
Presumption of Innocence: Amazing Case of Patrick Meehan, 1976 ISBN 978-0-575-02072-6
Death of the Tirpitz (also called Menace – The Life and Death of the Tirpitz), 1979 ISBN 978-0-316-48905-8
Wicked beyond belief: The Luton murder case, 1980, ISBN 978-0-586-05172-6
On My Way to the Club, 1990 ISBN 0-00-637079-9 (his autobiography)
Euthanasia: The Case for the Good Death, 1990 (ISBN 978-0-7011-3639-0)
Truth to Tell: Collected Writings of Ludovic Kennedy, 1992 ISBN 978-0-552-99505-4
In Bed with an Elephant: Personal View of Scotland, 1995 ISBN 978-0-593-02326-6
All in the Mind: A Farewell To God, 1999 ISBN 978-0-340-68063-6 (a critique of Christianity)