Frances

I *think* you may have written a book I read many, many years ago as a nine year old…about two misfit teens. All I remember is that they wander into a bookshop (of sorts) and buy a book that's written in code…they crack the code, and can make time speed up (something to do with a pen, pointed at a clock in math class)? I hope this is indeed, a book you wrote, or this is a very awkward email! I did try to Dr Google it, but had no luck. Thanks!