From the description of The Hobbit at Wal-Mart's website:
On the Battersea Reach of the Thames, a mixed bag of eccentrics live in houseboats. Belonging to neither land nor sea, they belong to one another. There is Maurice, a homosexual prostitute; Richard, a buttoned-up ex-navy man; but most of all there's Nenna, the struggling mother of two wild little girls. How each of their lives complicates the others is the stuff of this perfect little novel.The adventures of the well-to-do hobbit, Bilbo, Baggins, who lived happily in his comfortable home until a wandering wizard granted his wish. (via fark.com)
I am sure there is a reasonable explanation for this, but in the meantime, enjoy!
I found that the description is for the book Offshore.
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.