Lewis and Hathaway must trawl through Ancient Greek clues to find the murderer of two prominent figures from Oxford University.
A chance encounter means Luther might be on the verge of finding love. But nothing comes easily - not when a fetish killer is on the hunt, not when an internet tormentor has had the tables turned and not when his worst enemies are his own colleagues.
Psychic powers and stone beasts run riot in old Pompeii, but can Donna dare The Doctor to change established history?
