A dinner party at England's Oxford University is interrupted by an arrow shot that sends Nancy on a strange journey through the school's medieval corridors. She must find out the meaning of a clue left behind, a black rose. The search for answers moves Nancy to explore the life—and death—of Dame Gwyneth Davies, the famous mystery writer and playwright. And as Nancy draws back a veil of family secrets, she uncovers a real-life drama that could end in tragedy.