Mi Sweethart is easily the world's greatest secret agent; it's really no contest. But a holiday would be nice, so for the first time since she was eighteen, Mi is taking a break... or she would be if it weren't for the sword-wielding assassin in her back garden. Thanks to Mi's unihemispheric sleep pattern (it's a real thing, look it up!), Mi never has to stop. While some would squander this extra time watching acclaimed TV drama, Mi has spent it becoming the best at everything, but will being the best be enough for what's coming?