When she falls asleep, Sapphire's consciousness moves to the body of swordfighting heroine Safire. Or maybe it's the other way around; both worlds are portrayed as equally real, although Sapphire's world is the more familiar. In any case, the result is that the two women share one mind, and only one of them can be conscious at any given moment. This is an entertaining conceit, and gives rise to a number of strange situations: both girls are prone to dropping out of consciousness, and Sapphire studies medicine and explosives to better equip Safire for her life. A third thread is provided by scenes from Safire's early life. All in all, this is a compelling and imaginative adventure.