- In June 1980, several London newspapers ran obituaries of her after she had been taken to intensive care in Christchurch, NZ. She lived another two years.
- Her first name is pronounced "NIGH-oh".
- She was actually born on April 23, 1895, according to reliable reference sources; but her father gave her birth year as 1899, thus starting her life with a mystery; no wonder that she became one of the most popular mystery writers of the 20th century. Her mystery novels are intellectual and are influenced by S.S. Van Dine.
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