Wild: From Lost to Found on the Pacific Crest Trail, this is a compilation of columns that she wrote as an advice columnist at The Rumpus.
The letters she received are really about everything, but mostly about relationships and love. Her columns don't read like Dear Abby columns. Instead, she delves into her own experience and tells stories from her own life. Her answers are not short, but they are really interesting and usually, the letter writer already has a clue about what they want to do. Sometimes they just lack the courage to do it (quit the job, dump the boyfriend, say No to an unhealthy situation).
This is a very dense book. You definitely get your money's worth. I could only read one letter and answer at a time, so it took me weeks to finish, but it was a thoughtful read.