Koenigsmark, the Grand Duchess of Lautenbourg, No. 6 (continuation). Vignerte senses a drama that is at the heart of the mystery that envelopes Koenigsmark. He found the designs of the architects who worked for the Dukes of Lautenbourg; a Catalan, Giroud, undertook work as a locksmith. Received from the intendant of the Chateau of Koenigsmark the sum of 300 pounds to put a secret lock on the chimney of the armory Giroud. The Armory. The secret lock. The numbered dial is divided into 26 compartments. 26 ... the number of letters in the alphabet. End of the first chapter. The second and final chapter is titled: "The Secret of Koenigsmark. END.