The Mountains Have a Secret (1948) is a novel by Australian writer Arthur Upfield.
It is the twelfth of the author's novels to feature his recurring character Detective Inspector Napoleon 'Bony' Bonaparte.
It was originally published in USA by Doubleday in 1948 under their Crime Club imprint.
[4] Writing for the Western Mail (Perth) a reviewer found that Upfield "provides the reader with an extraordinary end to the story—quite unsuspected and rather startling.
Some readers will be delighted at the final sequences; many will feel that they might be much too far-fetched even for thrillers which are allowed a great deal of latitude.