Miriam, Doris, Inès and Christiane have been friends since their school days, but now they have to face the secrets of the past. For Miriam, a successful public prosecutor and mother of three, the secrets put her marriage to Joachim in danger. Doris successfully runs a haulage company, but is overshadowed by her overbearing mother. Inès has spent many years in Paris and is now returning to Zollberg. She also hopes that her son will finally get off drugs. Writer Christiane suffers a terrible loss, but can count on her friends. In small steps she finds her way back into life, but can she also get closer to her husband again? Commissioner Elfriede Grünberger's investigation bursts into all this. Together with her colleague Leodolter, she tries to solve a murder that had long been thought to be a suicide. The trust and cohesion of the four friends is put to a hard test.