Spring 1543. King Henry VIII is wooing Lady Catherine Parr whom he wants for his sixth wife. Archbishop Cranmer & the embattled Protestant faction at court are watching keenly for Lady Catherine is known to have reformist sympathies. Matthew Shardlake meanwhile is working on the case of a teenage boy who has been placed in the Bedlam insane asylum before his terrifying religious mania leads to him being burned as a heretic. When an old friend is horrifically murdered Shardlake vows to bring the killer to justice. His search leads him to Cranmer & Catherine Parr -- & to the dark prophecies of the Book of Revelation. As London's Bishop Bonner prepares a purge of Protestants Shardlake together with his assistant Jack Barak & his friend Guy Malton investigate a series of horrific murders which are already bringing frenzied talk of witchcraft & demonic possession -- for what else would the Tudor mind make of a serial killer.. .?