Miles’ twin brother Mark is back. He manages to infiltrate the Dendarii while acting as Miles. In short order, he is taking a ship on a harebrained mission to Jackson’s Whole in order to free clones doomed to act as replacement bodies for the rich, a procedure which leads to the clones’ brain being dumped. Naturally, it all goes to hell, with Miles chasing after. Miles is shot “fatally” and cryo-frozen, at which point Mark is whisked off to Barrayar to meet the parents for the first time. Meanwhile, Miles’ frozen body is lost.
McMaster Bujold is back in good shape here. The first part of this book is merely good, but the fireworks really fly when Mark ends up on Barrayar. His mother, Cordelia, steals all the scenes she is in. A truly great character who does even better in middle age as a bit player than in the books featuring her as protagonist (Shards of Honor and Barrayar). The parallel plot following the lost (in several senses) Miles is equally engaging. One of the best in the series so far.
This novel is collected in the “Miles Errant” omnibus.