1879, Victorian London. Will-they-won't-they detective duo Minnie Ward and Albert Easterbrook are looking into two mysterious new deaths. This leads them to the doors of the Spirit Sisterhood, a spiritualist group with a suspicious focus on young women. 
Minnie smells a rat. Going undercover on her own at the organisation’s countryside house, she discovers a strangely compelling world of spirits and ghosts. But, without Albert or anyone she loves, Minnie quickly finds herself in very hot water. Can she get word out before it's too late?