OK, I know Snape is the Half-Blood Prince. I just meant that she had something to do with the book as well.
I did a very quick Google search and here are some theories on the first page I found:
Regulas Black had a locket in his house which Mundungus could of stolen...more
here
Another theory, RAB might never of made it back to the shore of the lake and might be floating in the water!
Also, Amelia Bones...she could have a secret first name
See
here