Tragedy strikes Minnie Ward's beloved Variety Palace Theatre when a man is found dead in suspicious circumstances. Along with private detective Albert Easterbrook, she investigates. The trail leads them from the streets of London to a grand country house in the Suffolk countryside, home of the shadowy Spirit Sisterhood, who promise their clients an audience with the deceased.

Minnie isn't buying it. She goes undercover within the Sisterhood and enters an eerie world of seances and mediums. But unravelling their secrets will bring Minnie face-to-face with ghosts from her own past. Can she get to the truth before the murderer kills again?