Cassie Edwards is, or was, a prolific author of Native American-themed romance novels. In 2008, the authors of the blog Smart Bitches, Trashy Books discovered that long passages of her books had been directly lifted from other, much better, mostly nonfiction books, with absolutely no attribution. This eventually led to her publisher dropping her.
This is a list of the plagiarized books and the Cassie Edwards novels that stole from them. Her research was excellent; what a shame that her skill, effort, and ethics were subpar.
The nonfiction (and, in one case, a Pulitzer Prize-winning novel) is what should be read instead, although try telling that to a Cassie Edwards fangirl.