The information in this book is highly detailed, drawn from official sources-- which is both the good news and bad news. The detailed pictures and documentation show the huge gaps in "the official records" and parts of the story that the UK was not comfortable with telling. If you have an interest in the STEN this is worth several times the rather steep price tag, but use of internet search engines to UPDATE the info is useful, too. The problem is you need the book first, then to search and fill in the blanks-- the search first method misses the clearly defined parts the book lays out for you.