Forget the notorious Great White. Today, a different shark is making headlines with stories of sightings and attacks not in oceans but far inland: the bull shark. With its special ability to tolerate freshwater, the bull can take its jaws where virtually no other shark can go: upriver! As human populations grow and bull shark habitats shrink, where and how will people and bull sharks collide? One obsessed team -- a famed marine biologist and an expert angler -- is determined to find answers and sets out to catch and explore this unique apex predator: fifty miles upriver!