Abandoned by his beautiful wife, Irene, Henry and their two young children, Thomas and Margaret, spend that summer in a tent on the edge of Black Pond. Henry, an itinerant butcher, struggles to provide for them, but often must leave them alone as he travels the county in search of work. He has not told the children why their mother left or if she'll return. When Mrs. Phyllis Farley, a prosperous neighbor, begins to woo the children as companions for her strange, housebound son, Henry must weigh an unusual proposition, the consequences of which may cost him everything.