The Daily Mail recently profiled the book and the author. The story includes a collection of preview images from the book, including a photo of Houdini in shackles that I've not seen before.
While today is the official release date, online retailers do not yet appear to have the book in stock. But Derek tells me the publisher assured him copies are on the way, so hopefully any shipping delays will be temporary.
The Great Houdini: His British Tours will not be released in the U.S. until November 2, 2017.
Purchase The Great Houdini: His British Tours at Amazon.co.uk (UK) and pre-order at Amazon.com (U.S.).