Hi there,
I've just bought it and am currently trying to work my way through it. It's not a particularly easy read TBH. 500 pages or so although not all will be relevant to you as it relates to children of all ages.
If you're absolutely against letting your DC cry it out, I wouldn't bother getting it as this is mainly what he recommends. Now that our DS is 6.5 mths we decided he was old enough to be left alone but ONLY IF we were sure he wasn't hungry, ill etc. It does appear to be working at nights for us (DS is not sleeping through but is wakening far less than he was and settling quickly when he does waken).
There is a good review of it on Amazon if you're interested. Better than anything I could write!