I was thinking the same and tried to find the english title of this book.
Read it like 4 times already in the last years, it's really, really nice.
Haha same, except the reading it for 4 times part.
I also suggest to read Erns W Heine's book, the one about Alamut and Hashashins. I can't say I know about it's historical accuracy but I really liked it. I couldn't find the English title of the book though, german titles everywhere.
Asha Atu As-Sirra, is my favourite chapter of course