Laura Thompson's Agatha Christie: An English Mystery is Harbour Bookshop's Book of the Month for September.
The popular book, which normally retails for £20, will now cost just £16 for the rest of the month.
Agatha Christie: An English Mystery is the first major biography of Agatha Christie for more than 20 years.
Thompson has enjoyed unprecedented access to the Christie family's unpublished letters and papers.
The result is an intriguing account of a remarkable and complex woman.
Harbour Bookshop can be found at 2 Mill Street in Kingsbridge. For more information, call 01548 857233.

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