I, too, found the book sad and often depressing, but I was nevertheless riveted to it, and I don't regret reading it.
I didn't know she'd written a new book. Thank you for the information, Solus sto. I went to Wikipedia to find out more about it and was interested to read there that "Happens Every Day" was selected as one of NPR's "Fresh Air" Top Ten books for 2009.
PS I'm a L&O fan, and I freely admit that it was the author's SVU role that originally drew me to the book!