If you tend to read loads of urban fantasy. This book is perfect for looking up all the obscure (to me!) mythologies, that writers tend to love using in their books!
The Bible is not ekstremely thourough,(meaning that some creatures have several pages, like dragons and unicorns, but most have a page worth of text!) but it tells you the basics, with very nice pictures. So you have a better chance of looking it up on the internet, if you want to know more!
The book itself is not very big, but it is very thick!
This is a must have for any fantasy geek and absolutely worth the money!