The secret of life in the Northwest runs in packs of silver; as with most mysteries, it lies just below the surface, evident to anyone who thinks it important enough to look. At Willamette Falls, this secret reveals itself in rare flashes amidst the industrial clutter of Oregon City. The river here is a beast of burden, powering the street lights of nearby Portland, grinding wood pulp to paper, settling into locks that lift ships on their way. Against this metallic frenzy a few chinook salmon hurry upstream, driven by a singular impulse to pass on the baton of life and then die. To the continued befuddlement of biologists, they return to the neighborhood of their youth after seeing the world. In the fall, as the ground goes cold and the fields die, they bring a dose of fertility in from the sea, carrying the collected natural history of the Willamette in their gene pool. Fornication, in the ritualized style of the Pacific salmon, is never more charitable—or fatal.