I've only read to page 74, what I like is how it written from a child's (Jack) perspective.

From what I gather Ma is being held prisoner against her will in this room and subjected to abuse by Old Nick, she's even had his child.

Another incident because Ma didn't do something she got the blame and Old Nick ended up strangling her leaving bruises on her neck.

I'm no not sure how dark and horrible this story is heading.