I haven't thought about Mary Downing Hahn in years, but earlier this week when I was racking my brain for scary books I've known and loved, I suddenly remembered Wait Til Helen Comes and I was just absolutely flooded with nostalgia for one of my favorite YA authors of all time. Not only is she a former librarian (holla!), she was also writing YA back when it wasn't really a thing, at least not a lucrative, blockbuster movie-spawning franchise thing. Along with Judy Blume and Phyllis Reynolds Naylor, she was just writing really excellent, stand-alone novels for teens.