Time for some trolling. xD
Definitely doing that for Harry Potter books lol, fuck that author (she who shall not be named).
Best let them come up with the idea, then you publish it the next day, and watch the author’s reaction:
“Someone has already published a book on the same idea? Nooo wayyy!”
[Insert “U Mad Bro” Trollface Meme]
It would only be funny if the day before release you were to mail a copy of this book to the author with a note that said “this has been my favorite book since 1981”.