The book is written in the Greek language  

 Το έκτο κλειδί

For more information about its presentation and some excerpts (in Greek language):

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The sixth key

Detective story 

ISBN 978-618-82752-7-0

293 Σελίδες Α5

Available in PDF and EPUB format on websites :

EPUB & PDF 

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The book, in electronic form, is also available (free of charge) by the author. You can order it from the "CONTACT" page following simple instructions.