Three times TODAY I've gotten interesting queries with pages enclosed (good!). I've read the pages. I've said no. Why?
Cause those three pages are ALL wind up. It's people waking up to a phone call, driving to a destination, or god help us just telling me all about her situation.
DO NOT DO THIS.
Start with action that conveys conflict, challenge or a new situation. You can describe something if what you are describing is ACTION.
I routinely say no to these. Why? Cause I'm getting more queries than ever before and I have enough good ones that I don't have to ask for ones that need editing on the first three pages. And if you don't recognize this flaw your own self, I'm deeply afraid of what else you don't recognize.
You may have a great novel, but in your query letter I see ONLY the first three pages. Make them count.