Twenty miles off the coast of San Francisco, this small chain of islands hosts a yearly migration of seals... and during this time of year, the sharks are here too – the biggest, hungriest Great Whites in the world. Attempting to swim off these shores is attempted suicide. Colin Mason – wealthy, connected – with one leg bitten off by a white shark in these very same waters – now hosts his own yearly event – a marathon swim through the Great White-infested Farallons, The prize is a million dollars – winner takes all. How much is your life worth?