The book is very well written, and kudos are due to Heather Dune MacAdam for her ability to listen to, draw out, and summarize Mrs. Gelissen's memories. I found the footnotes relating events in the narrative to external documentation are very useful. I would have liked more of these, but I think their inclusion would have spoiled the overall flow and the book is better for their absence.
A particularly powerful theme in the book is the sense of monotony that Mrs. Gelissen and others survived: "4 a.m. Raus! Raus!"--this is repeated over and over in each section--followed by hard labor.
After reading "Rena's Promise" I could not imagine how she (and the other survivors) reconstructed their lives after 1945. It is an amazing thing.
I think "Rena's Promise" and Elie Wiesel's "Night" provide excellent personal accounts of Auschwitz-Birkenau. Neither are heavily footnoted historical references (Gutman's "Anatomy of the Auschwitz Death Camp" being an example). I would also recommend "We Were in Auschwitz".