Twists in the plot

Telling someone there’s a twist in the plot of a book is nearly, in my opinion, as bad as giving away the ending of a book. However, how else can I let potential readers know that this might be the book for them? Answers on a postcard, please…
Here are some titles of books that took me by surprise as I read them. I’ll say no more than that, as I’ve already said too much.