I still don't get why these little publishers would even want to risk the lawsuit and recall expenses that could come from taking something like this on. It's probably a combination of ignorance and greed that brings out defense statements like this:
Silverman, whose company distributes books by about 150 publishers, called "60 Years Later" a work of "social science fiction," saying that California doesn't plagiarize, but sets a well-known character in an alternate place and time -- as literature has done for centuries.
Fail and epic fail! This person needs to sort out the differences between plagiarism and copyright violation. Technically, only one is illegal--and that one's the one we're looking at.
Methinks this particular author and Lady Potato Moon need to get together and justify themselves to each other, in a vacuum, for the rest of eternity.