On her eightieth birthday, a lawyer gives Frida Borel, the wealthy heiress of a textile fortune from St. Gallen, a mysterious pill from the legacy of her father, who died long ago. This miracle pill is supposed to relieve her of the misery and infirmity of old age. The effect is as surprising as it is far-reaching: Frida becomes physically young again, although she remains mentally the same age as before. But who is going to believe a 25-year-old who claims to be 80? Not even her long-time garde...