Two great white shark males, believed to be brothers, are at the heart of a mystery. Could these animals recognize, and prefer the company of, a blood relative? A team ventures to the famed Isle of Jaws off the West Australian coast and finds the answers.

In sunny California, Leeanne Ericson is out for an afternoon swim when suddenly she is attacked by a great white shark. And, Spearfisherman Braxton Rocha is having a great day in the water when a tiger shark comes out of nowhere and attacks him.