A very interesting idea, but somewhat confusing in its execution. The novel has parallel narratives about a police detective investigating a series of murders in contemporary London and of Nicholas Hawksmoor rebuilding the churches of London destroyed in the great fire of 1666. Hawksmoor is an real historical figure who filled his churches with pagan and masonic symbols. Ackroyd portrays Hawksmoor as a Satanist who consecrates each church with a murder. The 17th century murders parallel the 20th century murders, but exactly how this can be happening is the big mystery.