After the first couple of pages I was sure I'd read this before. And I had, sort of. The setup is remarkably similar to that of Heinlein's "Revolt in 2100", and also bears resemblances to that of Margaret Atwood's "The Handmaid's Tale": modern America has tipped over the edge into a theocratic basket-case dictatorship. In order of publication, Heinlein was first, then Atwood, then Farren, and I'd not be at all surprised to learn that Farren had read both of the others. But that's OK. He has taken those same ideas and gone in a radically different direction, his story being far grimier and more accessible than Atwood and, unlike Heinlein, lacking a happy ending. Farren's revolution eats its children and according to the epilogue actually ends up as an even worse police state than it started.
I whole-heartedly recommend it. It's very accessible and will easily transcend the boundaries of genre. I recommend it to everyone.