Sabine Baring-Gould (1834-1924) was a famous English antiquarian and folklorist, and this is his treatise on werewolves and lycanthropy. It was the first comprehensive study on the subject, and provides accounts of shape-shifting creatures from many different cultures, including material on viking berserkers. 'The Book of Were-Wolves' is a highly impressive study, and a must-read for all would-be lycanths, or for those who merely have a passing interest in the topic.