Rome, AD 71: Against his better judgement, Marcus Didius Falco secretly disposes of a decayed corpse for the Emperor Vespasian, then heads for the beautiful Bay of Naples with his best friend Petronius. It's an opportunity to forget his doomed romance with the beautiful and bright Helena Justina. He conveniently forgets to mention to his companion that this will be no holiday - they have been sent to investigate the murderous members of a failed coup, now sunning themselves in luxurious villas and on fancy yachts. Nor does the idyllic seaside location help matters with Helena. The deeper he probes, the more it seems she is inextricably connected to the elite plotters, in ways that the smitten Falco cannot bear to contemplate ...