The book (without giving away too much in the way of spoilers!): second instalment in the Vorkosigan saga: Cordelia, offworlder, has married Aral Vorkosigan and settles into a quiet estate life - when Aral gets saddled with an important task by the Emperor. Before she knows it Cordelia is leading a high-profile Barrayar life, still astounded by quaint and plain weird Barrayaran customs - and making her imprint, too. What she cannot change is the bloody revolution the Vorkosigan family becomes embroiled in, and she and her unborn child become important pawns in the highest of political stakes.
The author: Lois McMaster Bujold has written several series of books (including the Vorkosigan Saga, of which is the second part, and consisting of a series of full-length books as well as short stories) and several stand-alone novels. She has won the Hugo four times, as well as the Nebula twice, the Mythopoeic Award, the World Fantasy Award, and recently the Skylark Award.
My opinion: Bujold can write like a dream, and this is another example of her class. I am a sucker for her style, her imagination, and her personalities: vivid, fully three-dimensional, many things implied and not spelled out completely; humor, love, and a consistent Universe (well, kind of anyway). She writes with *feeling*, with soul; and manages to convey that so you feel a lot of the personalities' grief, fury, fear and joy. She can bring tears to my eyes, too - a rare writer.