Miles is reassigned to investigate a suspicious military buildup near a wormhole nexus. Reviving his undercover persona as mercenary Admiral Miles Naismith, he expands his routine information-gathering duty into a rescue mission when the Emperor of Barrayar disappears. Miles must use his negotiating skills to avoid a showdown between powers competing for control of the wormhole, while searching for the Emperor and watching his back for the arctic base commander seeking bloody vengeance.