John & Emery Bonett were the noms de plume of John Coulson
and Felicity Carter, whose series characters were Inspector Borges and
Professor Mandrake. The books are perhaps better known to collectors
than readers. This is a shame, as their characters, especially Mandrake,
are well constructed and set in well plotted scenarios. English
editions, except for one, precede and print runs were relatively small,
making them uncommon in collectable condition. The hyperlinked titles
above go to pictures of the first two books in their classic jackets.