"The Heart of an Adventurer" is a book that, by the author's will, exists in two separate editions. This edition presents the first edition, subtitled "Notes Day and Night," published in Germany in 1929—ten years before the second, "Figures and Capriccio." In this unique artistic notebook, Ernst Jünger's diary entries, dreams, and observations from the Weimar Republic are distilled into essay-sketches that lift the veil on a demonic world impenetrable to the daylight of reason. This text, by one of the 20th century's finest stylists, was previously published under the title "The Risky Heart," translated by Vladimir Mikushevich.