Their relationship was further embittered by Speer's failure to mention Wolters by name in Speer's first book based on the Spandau material, "Inside the Third Reich". Speer's initial draft of the book, written while in Spandau, does mention his "old university friend, Dr. Rudolf Wolters, to whom was assigned the most essential task, the "Prachtstrasse"" in connection with the Berlin project. However, Wolters' name appears nowhere in the published version, and no mention is made of Wolters' help, essential to the writing and preservation of the draft memoir. Speer later told his future biographer, Gitta Sereny, that he did so to protect Wolters, since it might have been risky for Wolters to have been known to have assisted an imprisoned war criminal. Sereny notes in her biography of Speer that it would not have been in Speer's interest to have publicized Wolter's assistance, given the growing disagreement between them over Speer's statements. Wolter's son, Fritz, suggested that had Speer mentioned Wolters even once, "it would have made all the difference", since it would have shown that Speer acknowledged the debt he owed Wolters for his efforts during his incarceration.