When Hercule Poirot receives a request for help from a woman who has been dead for a month, he decides to investigate the circumstances of her death.

The third installment of Dorothy L. Sayers' mystery series unfolds at the all-female Shrewsbury College in Oxford. Upon returning for the first time in years for a school reunion, Harriet Vane is asked by her old professors to turn her talents as a detective writer to practical use. Someone is terrorizing the faculty and students of the college by sending vicious, anonymous letters, eventually leading to the destruction of collegiate property and...