This is a special book that was written in 1940. It includes old photos dealing with old Goshin Jyutsu techniques, special defences against knives and the use of various tying up techniques. There are a lot of really unusual techniques taught all before WW2 and yes it is very good.Includes Escapes, joint locks, combinations, kiai Jyutsu, resuscitation skills, zanshin, etiquette, sword and knife defences, spitting needles, chain defences and so much more never taught before to the western world.