What is the author's style in Five Chimneys: The Story of Auschwitz by Olga Lengyel?

The story is written in first person, completely from the perspective of the author, Olga Lengyel. This is the only option open because the only purpose, according to her writing, is for Olga to tell her story. The book includes a dedication which reads, "Dedicated to the memory of my parents and husband, my godfather and children and to my fellow inmates of Hitler's concentration camps of World War Two who, silenced for ever, are mostly forgotten - 1959." This dedication further outlines the reason for her resolve to tell the story.