Still reeling from a shocking revelation, guardian trainee Calla Larkenwood finds the threads of her world unraveling further when she's accused of a horrifying crime she didn't commit: A deadly magical disease has entered the Guild, threatening to wipe out every guardian—and someone is intent on framing Calla for it. 

With the Guild Council focusing their investigation on her instead of searching for the real criminal, Calla watches her dream of becoming a guardian rapidly slipping away. 

Time is running out. As the lines between good and bad, right and wrong, begin to blur, whom can she turn to for help?