In 2017, five full-grown great white sharks washed up dead on beaches in South Africa -- they had been eaten alive by orcas. Shark biologist Alison Towner is searching for the killers in the grisly crimes and sleuthing to find out if the whales will attack again. She's joined by conservationist Chris Fallows as well as filmmakers Jeff Kurr and Andy Casagrande to find out how these great whites are being wiped out and what can be done to save them.