Ally Carter said this quote

So far Kat has been through all the Wa's she could think of, but Hale hadn't admitted to being Walter or Ward or Washington. He'd firmly denied both Warren and Waverly. Watson had prompted him to do a very bad Sherlock Holmes impersonation throughout a good portion of a train ride to Edinburgh, Scotland. And Wayne seemed so wrong she hadn't even tried.Hale was Hale. And not knowing what the W's stood for had become a constant reminder to Kat that, in life, there are some things that can be given but never stolen.Of course, that didn't stop her from trying.