What is the author's style in Dead Man Walking: An Eyewitness Account of the Death Penalty in the United States by Helen Prejean?

The story is written in first person from the perspective of the author, Sister Helen Prejean. In an interesting derivation from the typical method of writing in past tense, the author uses present tense which gives the story a sense of immediacy that might otherwise have been lost. Some aspects of the story are presented in the order in which Sister Helen observes the events. However, many aspects of the story are presented greatly out of order.