The Golden Rule in Russian. This is a kid's book that talks about how to act towards others. It is apparently a bible-based book and quotes the christian bible in a couple of places. I got it free with on my kindle and it was quite short and almost readable for an intermediate-level Russian Language student.
As it was free and stretched me a bit I think it was very much worth my time. I had to look up words to make sense of the text at times, I think it was about 5th grade level.