Examining the secret world of killer whales in the Pacific Northwest, Pitcairn reveals both these enigmatic marine mammals and the rich habitat in which they live. In the spring, the waters off British Columbia greet the arrival of two great hordes from the open sea — herring and salmon. Predators, including humans, join in a harvesting frenzy, but none are as efficient in their hunts as the region’s pods of killer whales. Pitcairn also films a side of these powerful creatures few see, their efforts to maintain a close family life and the moments when they appear to be looking for nothing more than sheer fun.