Walter is the author of four science fiction novels published by Tor Books – the Dark Wing series, which has been compared to the writing of Orson Scott Card, Frank Herbert, David Weber, and J.R.R. Tolkien. It has been published in English and German, and The Dark Wing has appeared in Russian. His new novel, A Song In Stone, deals with the mystery of Rosslyn Chapel and the secrets of the Templars. He has been a writer all of his life, and a full-time professional since 2001.