Adi Zeitler, Willy Tindle and their friend Cynthia Lademaker don't just want coffee and cake. Numerous ailments of old age require sorely needed relief. Right now, before the upcoming funeral of Cynthia's husband, the trio is dependent on the proven painkillers. As always, the smell of coffee is in the air at the old pharmacist Karl Kreuzer. But in the back room next to the laboratory, Willy makes a grisly discovery: the pharmacist was stabbed to death in a macabre way. The drug addict Benny Marien can just escape the horrified Willyescape toilet. The Munich chief inspectors Ivo Batic and Franz Leitmayr have to inform Helga Müller, the good spirit of the pharmacy, of the death of their beloved boss. Chief Inspector Carlo Menzinger is ordered back from his well-deserved short vacation at his mountain hut.
Gradually, the three investigators gain insight into the world of the elderly and those left alone in this murder case. But the senior trio tries steadfastly to fight for a happy old age in the face of illness and hardship.