"mainly leather-bound series of books about the Third Reich, which Geoffrey sends off for from Reader's Digest."
Reader's Digest Book
Creative Commons Attribution Share AlikeReader's Digest Book - Credit: Kungfuman, Wikimedia

  The Third Reich refers to Germany under Nazi leadership, from 1933 to 1945.

 Reader's Digest is an American company that publishes books and magazines covering a wide range of issues: current affairs, health and well-being, and dramatic real-life stories.  The UK arm of Reader's Digest went into administration in 2010, unable to fund a £125m pension deficit.