Stop there...what is WIP? You should add the definition to the Abbreviations from Hell discussion, because that is one I see and don't know what it means. From you using it, is it work-in-progress??
One of the members of my writing group suggested I think of titles but said my publisher (not that I have one...yet!) would probably change it. He did, however, say I should give my books' series a name...like Twilight saga...and that that would probably remain the same. So, you would have something like the Heather Wells Mysteries.
But, hey, I can't say for sure myself! : )