England, 1859. After Lorna Buchanan returns from her trip to India, she looks forward to a quiet life as a teacher in St. Ann's College. Instead, she gets tangled in a mystery involving murder and ancient, druidic practices. After Lorna is sacked by the tyrannical head teacher, she is recruited to solve the murder of Mr. Findhorn, a railway conductor. Liaising with Police Sergeant Caswell, their search for the murderer takes them deep into the world of deception, greed and age-old rituals. But is there something supernatural behind the crimes, or are they driven by a completely different motive? With clues few and far between, Lorna and Caswell must find the person responsible before more lives are lost.