Quote from bl82:
A second vote for Grant and "Trading Risk."
Don't worry about the math: there really isn't as much as you'd expect and it doesn't exceed what you probably already know if you have a working knowledge of statistics.
Quote from dtrader98:
+4
Agree on it being a great book, but definitely not very heavy on math.
More of a layman's approach.
You can also check out portfolio optimization, by ralph vince for an easy to digest book.