This is the fourth book in the series about private investigator Max Wunderlich. A successful, middle-aged businessman, Leo Fischer, asks a detective to keep an eye on his new fourth wife. The large age difference, as well as the frequent disappearances of the spouse in the evenings, which have no clear explanation, give rise to a lot of suspicions in the spouse’s head, including those related to adultery. The personal happiness of a middle-aged spouse is at stake! Detective Max Wunderlich takes on a case that does not seem difficult to him and which he classifies as cases related to the so-called “external surveillance.” However, the case of external surveillance results in a complicated story, replete with numerous criminal offenses...