If you enjoyed my previous book Constable Colgan's Connectoscope (also on this Unbound site), you'll know that it was the sequel to a previous book published by Pan Macmillan called Joined-Up Thinking. You can still get copies of the original hardback and paperback in shops and on the web. However, I recently got back the rights to J-UT and so I've updated it and slightly expanded it and it's now available as an e-book.
You can get it here and from other retail outlets.