The Lost City of Z: A Tale of Deadly Obsession in the Amazon by David Grann (2010). Narrative nonfiction (counts as not something I regularly read for my reading self-challenge) about Percy Harrison Fawcett's disappearance, along with his son and the son's best friend, in the Amazon in 1925 and David Grann's attempt to discover what happened to them through research and his own visit to the Amazon. Part mystery, part adventure story, and very well-told by journalist Grann.
The Call of the Ice: Climbing 8000-Meter Peaks in Winter by Simone Moro (2014). Italian climber Simone Moro shares vignettes about his alpine-style (quick, with as little supplies as possible) winter climbs. Without taking anything away from Moro's accomplishments or his flair for writing, I decided I prefer reading climbing books about the longer, siege-style assaults on mountains.
Women Loving Prisoners by Sylvia Redmond (2015). Three unrelated women, three related prisoners. Fairly graphic sexual content, but way more realistic about the men and their goals and the women and their weaknesses than romantic.
PS. . . You're Mine by Alexa Riley (2016). Sweet romance develops through letters between a high school teacher and a deployed Marine on his last tour before retirement. Quick, fun read.