When socially-awkward Alessia lands a coveted internship at Archos facility, it's everything she imagined and more. She doesn't just get to study 'magic' but help make it! But when her best friend's personality changes after a workplace accident, Alessia suspects that he has been replaced by something - else. And he might not be the first.

Believing the true Kai may be trapped in the mirror universe, Alessia sets out on a perilous journey across the frozen shard world, Fennoth, to find him. The cold and wild animals aren't the only things in her way: assassins from Archos are hunting her; a mysterious ice mistress is causing political trouble in the north; and the denizens of Fennoth have a deep-seated mistrust of anyone from Earth. Her newfound magery can help, but it's also dangerous. And even if she finds Kai, there may not be a way back home to Earth.