Chantecoq and the Haunted House by Arthur Bernède
My rating: 4 of 5 stars

1920s Morbihan, Brittany. Chantecoq and his secretary Meteor are in holiday when they are approached by M. Lachesnaye to investigate the strange happening in their home, and the substitute of their healthy son Jackie, by a very ill baby.
An entertaining historical mystery
First published in 1929

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