Year after year, in Kampen, the Hamburg plastic surgeon Dr. Claus Wiederkehr, his wife Valerie Wunderlich-Wiederkehr - a successful gallery owner and her husband's best client - along with the couples Bitterstein and Geier gather. This summer, they are celebrating two anniversaries: the twenty-fifth anniversary of their circle of friends and the silver wedding anniversary of the Wiederkehrs. Four days after the silver wedding celebration, a jogger discovers a body at the foot of the Red Cliff early in the morning. A single glance is enough to determine: it was not suicide. A delicate case for the Wattenmeer criminal police. For in life, the victim was part of the small anniversary society in Kampen. Chief Inspector Kuno Knudsen and his assistant Arne Zander soon realize that they must look for the perpetrator within Dr. Wiederkehr's circle. "The Peacock Feather Murder" was first published in April 2015 and is available.