When was was an English author, best known for his books about the teddy bear Winnie-the-Pooh only mystery novel published?
The Red House Mystery: The Red House Mystery is a "locked room" whodunnit by A. A. Milne, published in 1922. The Red House Mystery:  It was Milne's only mystery novel. A. A. Milne: Alan Alexander Milne ( ; 18 January 1882 – 31 January 1956) was an English author, best known for his books about the teddy bear Winnie-the-Pooh and for various poems.
1922