Oh, Mary, Be Careful!
Philadelphia: J. B. Lippincott Company, 1917. 178 pages. A romance. Mary moves in with her aunt, who collects stories of men jilting their wives and girlfriends, and warns Mary that she'll never find a suitable husband. The happy ending is that she falls for an invalid. No, really, that's the plot, and they even made a movie of it. ISBN: B00085ACSC.
First edition (first printing). A very good copy in a very good dust jacket.