Johann Fischer is the uncle of Baroness Adeline Fischer Hulot and Mademoiselle Lisbeth Fischer. After both of his brothers die, Johann becomes one of two unofficial patriarchs of the Hulot-Fischer clan. He shares the esteemed position with Marshal Hulot the Comte de Forzheim, Baron Hulot's older brother. Johann Fischer is just one of a number people who give Hector Hulot money to keep Hector's clandestine relationships afloat. Since Adeline suffers in silence while Hector carries on with other women, Uncle Johann feels a special sense of obligation to her. In the end, Johann Fischer discovers that Hector never intended to help him and Fischer, like the rest, is ruined. Shame over his unwitting part in the Algerian embezzlement scandal (perpetrated by Hector Hulot) is the reason Johann Fischer commits suicide in prison.