Dorothy Black is the assistant headmaster. She's also an assassin.

At the start of her third year at Confrere Preparatory Academy, Mui discovers Black's secret and is determined to learn more about the mysterious woman. An unexpected internship leads Mui to dive headfirst into charity work to get closer to Black. But along the way Mui stumbles across a sinister plot—one that will ultimately put Mui and Black on a collision course with a truth about Mui's father that neither they, nor Confrere, will escape.

The assassin's daughter doesn't disappoint. Pick up book three in this gripping series.