The handbook 'Scouting for Boys', written in 1908 by Robert Baden-Powell, may be largely forgotten today, but it is one of the most influential and best-selling books of all time. In the 20th century, only the Bible, the Koran and the Thoughts of Chairman Mao sold more. But they had fewer jokes, no pictures and were useless at important stuff like tying knots. In this entertaining and affectionate film, Ian Hislop uncovers the story behind the book which kick-started the Scout Movement - a work which is very eccentric, very Edwardian and very British.