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Frank (Klaus Loewitsch) has been making love with his stepmother Rachel (Erika Pluhar) for years. In fact, though he doesn't know it, his step-brother Roman is actually his son. Unfortunately, brother-son or not, the boy hates him, and engineers a plan to kill him which backfires, and instead injures his beloved mother. At the same time, Frank's overly affectionate relationship with his stepmother is revealed for what it is, and he is expelled from the house. Rachel lingers on for some years, paralyzed. Years later, on her deathbed, she reveals to the now-grown Roman (Peter Sattmann) and Frank the secret of their true kinship. Frank, by this time an alcoholic mess, goes on a rampage and then disappears during Rachel's funeral, and Roman teams up with Frank's wife Sandra to find him.