Witches
by Ben Aaronovitch · Rivers of London series
When an American student is murdered in a London Tube station, PC Peter Grant — apprentice wizard and Metropolitan Police constable — is pulled into an investigation involving underground railways, transatlantic grudges, and something old living beneath the city. Aaronovitch's third Rivers of London novel is police procedural and magical London in equal measure, where the jurisdiction extends below street level.
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