I don't claim to be a master knife fighter, but I have found most of the information in this book elsewhere on the Internet and available for free. There were some parts that I found new and interesting. For example the chapters on rolling and closed knife techniques.But, everything thing in this book is still just an overview. The chapters are very short and don't go into much depth. They just give you a few pictures to work with. I was hoping to see detailed step by step manuevers for foot work and perhaps a detailed map of the body labelling pressure points.The book was not what I expected. Try google before you commit to buying a book.