A casket is dug up by contruction workers in the grounds of an historic convent. Inside is the body of a young nun. In a city as old as London, the discovery is hardly surprising. But when scratch marks are found inside of the casket lid, Detective Jane Tennison believes she has unearthed a mystery far darker than any she's investigated before. However, not everyone agrees. Tennison's superiors dismiss it as an historic cold case, and the Church seems...

After her mentor and lover, Detective Chief Inspector James Langton, is nearly killed by the gang members he is pursuing, Anna discovers a link between a cold murder case she had been working on and Langston's, only to discover that Anna, herself, has become the next target.