Because Luz celebrated his birthday with his wife on January 7, he only arrived at the Charlie Hebdo office after the attackers had already fled. He was unable to draw for a while. However, with "Katharsis," Luz returned to drawing. In images and texts, he recounts the fear and horror, the time afterwards when he left Charlie Hebdo as an editor and had to figure out how to move forward: "I now felt the need to show what my inner world looks like." This book is overwhelming, marked by a shocking openness and, above all, a liberating humor.