''The Unicorn Murders'' is a

mystery Mystery, The Mystery, Mysteries or The Mysteries may refer to: Arts, entertainment, and media Fictional characters *Mystery, a cat character in ''Emily the Strange'' Films * ''Mystery'' (2012 film), a 2012 Chinese drama film * ''Mystery'' ( ...

novel by the

American American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, pe ...

writer

John Dickson Carr John Dickson Carr (November 30, 1906 – February 27, 1977) was an American author of detective stories, who also published using the pseudonyms Carter Dickson, Carr Dickson, and Roger Fairbairn. He lived in England for a number of years, and is ...

(1906–1977), who published it under the name of Carter Dickson. It is a

locked room mystery The "locked-room" or "impossible crime" mystery is a type of crime seen in crime and detective fiction. The crime in question, typically murder ("locked-room murder"), is committed in circumstances under which it appeared impossible for the perpetr ...

(more precisely, it is a subset of that group, an impossible mystery) and features his series detective, Sir Henry Merrivale.

Plot summary

Kenwood Blake is with the British Secret Service and romantically involved with another agent, Evelyn Cheyne. Together with Sir Henry Merrivale, they become embroiled in a battle between Flamande, the most picturesque criminal in France, and his arch-enemy Gaston Gasquet of the Sûreté. Both Flamande and Gasquet are masters of disguise, and no one knows what either man looks like. Blake, Merrivale and an assorted group of strangers are in an airplane that is forced to land near the Château de l'Ile, where the Comte d'Andrieu is apparently expecting visitors and offers them all his hospitality. One of the plane's passengers falls to the ground with a hole in his forehead, as if he had been gored by a unicorn, and the area where he fell was under observation by impartial witnesses such that it seems impossible for anyone to have committed the murder. Sir Henry must sort out the twin problems of who's really who and whodunnit.

References

1935 American novels Novels by John Dickson Carr Novels set in France Locked-room mysteries William Morrow and Company books {{1930s-mystery-novel-stub