I've read three or four books now that claim to have "inspired the TV series Call the Midwife", though I've never watched it. This one, unfortunately, was fiction. I guess I can understand that the nuns wanted their privacy, and I respect that, but the author makes it all a bit convenient, a bit wonderful, a bit nick of time. I also got the impression she had read Godden's classic "In This House of Brede" (sorry, GR won't let me insert a link today for some reason), as some of the scenes such as the woman waiting to hear whether she has been admitted to solemn profession or not were awfully familiar.
Another thing I stumbled over were some of the author's misconceptions, if I can use that in talking about a book about midwives. Iknow that there were other Anglican orders (and still are) that wore the habit and took solemn vows well before 1945. I direct the attention of the interested reader to the life of Dora Pattison. Batten's explanation of a woman and her baby being "churched" was rather odd as well; anyone who knows their Bible knows that it goes back to Mary and Joseph going to the temple 40 days after Jesus' birth, which is why infant baptism is still practiced among Anglicans, Lutherans etc. However, Batten prefers to speak of it as some sort of "repressive" ceremony, which it is not. I suppose I should be grateful she avoided the buzzword "patriarchy."
As other reviewers have said, there was a bit too much about the Nun's Progress and too little about actual nursing and midwifery for a book that claimed to centre on those aspects of the order's work. Therefore only three stars for a book that with a bit better development could have been a solid five. But then Batten wrote fiction, not fact. It's a quick, lite read.