"There is no light without darknesse and no substance without shaddowe". So proclaims Nicholas Dyer, assistant to Sir Christopher Wren and the man with a commission to build seven London churches to stand as beacons of the enlightenment. But Dyer plans to conceal a dark secret at the heart of each church - to create a forbidding architecture that will survive for eternity.

250 years later, London detective Nicholas Hawksmoor is investigating a series of gruesome murders on the sites of certain 18th century churches - crimes that make no sense to the modern mind.

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