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It is 1851 and Mrs Rodd has received an unusual commission: wealthy businessman Jacob Welland is dying of consumption and implores redoubtable detective Mrs Rodd to find his beloved brother, whom he has not seen for fifteen years.

Joshua Welland was an Oxford scholar; brilliant, eccentric, and desperately poor. Nobody can say exactly when he disappeared from his college but he took to wandering the countryside, and one day simply failed to return. Since then, there have been several sightings of his lonely, ragged figure while a friend who spotted him in a gypsy camp, reported Jacob said he was learning great secrets that would one day astound the world.

Mrs Rodd uses her search as an opportunity to reconnect with a couple from her past but then a violent murder is committed, and Scotland Yard are called to investigate. Mrs Rodd's old friend Inspector Blackbeard doesn't want to hear any nonsense about gypsies or secrets, but Mrs Rodd is convinced that something very sinister - and extremely dangerous - is lurking in this peaceful landscape.