Doherty's fifth ancient Rome mystery, the first to be released in the U.S., picks up with former legionnaire Attius Enobarbus found murdered in a locked room. Emperor Constantine's mother, pious Christian Helena, dispatches her servant Claudia and the ex-gladiator Murranus to find the secret Attius held: the location of the tomb of the apostle Peter. Claudia discovers that Attius was suspected of being the Nefandus, a brutal serial killer, but the...