For generations, anglers have been hooked by the biggest, fastest, most dangerous gamefish in the sea - the graceful sailfish, the menacing swordfish, and the biggest trophy of them all, the marlin, the great fish immortalized by Ernest Hemingway in his classic, The Old Man And The Sea. But these ancient and amazing creatures have long been shrouded in myth and mystery. Join dedicated marine biologist and ward-winning filmmaker Rick Rosenthal, who for two decades has set out on a personal quest to film these sword-wielding giants face to face in the deep, blue uncharted waters of their world. This very special episode of Nature unlocks some of their secrets with awe-inspiring sights never before captured on film, an undertaking that becomes even harder as the fishing industry continues to decimate their populations and those of their prey.