I think there was an explanation of sorts. It referred to pages in the biography, but iirc, I felt that there wasn't enough motivation for them to be sent to the film woman (fliss?). Is that what bothered you?
To be fair, I read it in the early months after ds2's was born and might have completely misread it.
I liked The Other Half Lives. And the one about the bad mother.
Will take a flick through later.