In the depths of Australias Southern Ocean a Great White Shark is savagely attacked by a far larger mystery predator. An electronic tracking device attached to its fin records a high-speed underwater chase before the shark and its tag are devoured. Two weeks later, after being carried in the belly of the unknown killer, the still functioning tag is excreted and washed ashore, withholding clues that could reveal the identity of the sharks super predator. This is the story of a super predators underwater attack that leads investigators to a mysterious natural phenomenon that attracts the oceans most fearsome predators.