Whose waves these are

"In the wake of WWII, a grieving fisherman submits a poem to a local newspaper: a rallying cry for hope, purpose ... and rocks. Its message? Send me a rock for the person you lost, and I will build something life-giving. When the poem spreads farther than he ever intended, Robert Bliss's humble words change the tide of a nation. Boxes of rocks inundate the harbor village on the coast of Maine, and he sets his calloused hands to work. Decades late...