The first in an Italian crime series set in Rome. Whilst Sara Farnese pours over ancient texts in the silent and beautiful Vatican reading room, a crazed man enters carrying a bloodied bag. He walks up to Sara's desk. He has something he would like her to see . Sara is inextricably linked to a series of horrific murders, each one representative of the death of a martyr of the Church. Enter Detectives Costa and Rossi. They must protect Sara whilst hunting down the killer, and time is running short.