'I lit the candle and began rather gingerly to climb up the ladder. Then I heard a distinct sound above my head. A scrape on the floor, an irregular jarring on the floor above my head, like something rocking ...' A nun is dead - her emaciated corpse has been discovered locked in the tower of Blessed Eleanor's Convent. The tragic consequence of a neurotic young woman committing to a life of isolation and piety, the inquest concludes. But this young woman held unusual power over the convent - power she was planning to use. Jemima Shore tries to keep her distance from the case, but when her lover cancels their holiday she finds herself reluctantly getting involved. A violent attack in the dead of night and another death convinces her that the convent is not the haven of peace it appears to be. Suspicion and fear hang heavy in the air but how do you solve a murder no-one will admit happened?