1A

Any thoughts on the prologue?

Short, but not necessarily to the point. A hint that there has been a death at a posh house - perhaps a murder, committed by a young woman (17 years old).
Thirty years in the past, so I'm expecting the 6-7 year old boy to be be a 37-y-o main player in the current setting.

Something about a 17 year old girl who committed murder in 1969.

I agree. Something about the 17 year old girl that committed murder. I wonder if she is Pauline Brent...the woman that seemingly has no past that anyone knows about.