The book arrived in a few days and like most other Alan Moore books was a gripping but difficult read.
Instead of spoilers I'll just quote.
I don't know who you are. Please believe. There is no way I can convince you that this is not one of their tricks. But I don't care. I am me, and I don't know who you are, but I love you.I'm sure you'll want to read the rest of Valerie's letter.