The bulk of the story is set in 1840 in England (with an end scene in the Orkneys), and features a number of talented women who, in most cases, are unable to use their abilities to the full due to the subservient position of women. Etta is the daughter of a nobleman and a freed slave, born in the West Indies and brought up on her father's estate in Shropshire. She is a talented botanist, but is constantly dismissed as a hobbyist, as well as encountering racism. As the story opens, her half brother, who was jealous of her and has contrived to push her into an increasingly marginalised existence, has poisoned her faithful dog. Grief stricken, Etta runs into the woods and experiences a drastic physical transformation, growing wings.
Londoner Mary has been fortunate to be raised by two men who managed to conceal their true relationship, to avoid going to jail. Uncle George has died fairly recently, and Uncle Jos takes to drink, so Mary has to support them both, partly by piece work, sewing buttons onto card, and partly by writing the newspaper articles that Jos is too drunk to finish. Luckily, their close friend, journalist Richard, returns from Edinburgh and helps secure work for Mary, writing book reviews. She embarks on an investigation of rumours spreading around London about an angel. These have been triggered by the discovery of a drowned woman with wings whose body was sold to an unnamed surgeon.
Natalya comes to London seeking her cousin, having been disowned by her family for becoming pregnant though she doesn't now have the child. She becomes the third woman to develop wings. All three fall into the power of Edward, an ambitious surgeon and religious fanatic who convinces himself that he is doing God's work, no matter how extreme his actions become. His changed and secretive behaviour disturbs his wife, Ellie, a talented painter who starts to feel she made a mistake in turning down the proposal a few years previously of her kind and supportive art teacher.
This is a story of the corrosive effect of ambition, overwork, jealousy and delusion. Some aspects I enjoyed, such as the relationship between Mary and Richard and Uncle Jos. Mary has the best outcome in terms of being supported by the men in her life, who are not threatened by her competence. In a straight info dump, the reader is told that Ellie, too, finds happiness in future. In fact, the style of the book does involve quite a lot of omniscient author viewpoint, with a lot of head hopping in scenes between characters to tell the reader what they are thinking.
One thing I should flag is the gruesome amputation scene early on, and a very graphic killing of a dog, as well as the fate of Etta's companion. This aspect is likely to upset some readers.
On balance, I would rate the book at 3 stars.