In 1942, Gusta (Gustawa) Ehrlich landed in prison in Krzeszowice. This Jewess from Cracow tried to survive the occupation hiding near Cracow. She was denounced and arrested. The presented collection of documents includes her diary in form of the letters to her daughter, being at the same time the record of Gusta Ehrlich’s last weeks. The author described the conditions in the prison and relation with the fellow inmates. She also left information concerning the person who denounced her to the authorities, informing them of her origin. In the notes, there are numerous hints for the daughters, who remained at large, concerning both the personal and financial matters connected with running the business. Gusta Ehrlich’s letter of 1940 to the Metropolitan Curia, in which the author asks for baptism, is a supplement to the diary