I do not lend books out to anyone except my Father (and we get ours mixed up so often that unless it is specifically a part of a series, neither of us worry too much). I cannot believe the disrespect some people show towards other peoples possessions, particularly books. And the number of people who will then lend them to someone else! Sorry, but if I lend a book to someone - it is ONLY for them. I would be really ticked off. If you are finished with something that you have borrowed you return it.