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]
I’d be all up in them Dead Sea Scrolls adding a preface page with a boilerplate “this is a work of fiction, any similarities to persons living or dead or undead are purely coincidental” disclaimer.