Hello, and first of all thank you for this great forum.
I'm in the process of writing articles on mysteries, and would like to bind them and give them the name "Book of mysteries".
Unfortunately I don't know people who studied Latin, and I've had some doubting experiences with Google Translate for instance.
What I got so far is:
Since I want to be 100% sure, I wonder, are both of them correct? If so, what is the difference between them?
What would you suggest as the correct/nicest translation?
Since it is a title, the word 'book' would start with a capital letter.
Thanks in advance.