Under the Overpass: A Journey of Faith on the Streets of America by Mike Yankoski -- 256 pages
Mike paired up with a buddy named Sam and the two of them hit the streets, going to three different cities to live homeless with only a $3 sleeping mat, a backpack, a guitar, a Bible, and a journal.
Mike and Sam's account of living homeless is an eye opener to what it is really like to live on the streets. People turn away because you smell, they don't trust you because you are so ragged, and they don't help you because they assume you are on drugs or alcohol.
This story is one of faith and dependency on God, but even if you are not a Christian, it may answer some questions you've had and inspire you to help those in less fortunate situations.