In this work, the character of police inspector Keller appears for the first time, who fights crime with unusual methods.
Although this novel was not as successful as "08/15", it is certainly worth reading because it was written as a kind of moral condemnation of a society that achieved its prosperity by abandoning moral principles.
Although best known for the characters of Winnetou and Old Shatterhand, in this work Karl May brings a shorter, standalone adventure from the Canadian wilderness.