On a Sunday morning in August, Hofheim's chief police commissioner Oliver von Bodenstein and his assistant Pia Kirchhoff were faced with two suicides at once. But only one of them turned out to be real: the chief prosecutor of Frankfurt shot himself in his garden. But the young beauty Isabelle Kerstner did not die on her own, although everything seemed to indicate that she threw herself down from the observation tower. According to the examination, before this she was injected with a lethal dose of a drug used to tranquilize horses. And since Isabelle worked at an equestrian center, Bodenstein and Kirchhoff went there first. There it turned out that everyone was either afraid of the deceased or hated her. An unprincipled intriguer, Isabelle made many enemies for herself, and anyone could deal with her. But no one could have imagined what a long chain of crimes would follow the death of a woman who loved no one...