The farmer Kryštof Jahn lived with his wife Ludmila and their daughter Vlasta in the West Bohemian village of Postřekov (Possigkau). In April 1945 he found an unconscious girl in a nearby field. Since the girl was extremely thin and had shaven hair, Jahn suspected she had escaped from a camp. He carried the exhausted girl to his house and hid her, initially in a basement and then in his farmyard. With the German army still close to the village, Kryštof Jahn was afraid the Germans would kill him and his family if they found an escaped prisoner on their property. He therefore made a hiding place for Eva Löwidtová under the kitchen floor. Ludmila and Kryštof Jahn guessed that fifteen-year-old Löwidtová was Jewish. Ludmila took loving care of the girl until her aunt came to collect her at the end of June 1945. In 1949 Eva Löwidtová emigrated to Israel.
After the war, Eva Erben née Löwidtová campaigned for her rescuers to be recognized. Ludmila and Kryštof Jahn were honored for their help as Righteous Among the Nations by the Israeli Holocaust Memorial Center Yad Vashem in 1983.