At Mossgrove, the Phelan family farm, long-time hired hand Jack plays peacemaker as widow Martha Phelan battles her young son, Peter, who wants to modernise the farm. Tensions on the home front are bitter enough, but at the Conway farm across the river, more trouble is brewing. Slovenly Matt Conway feels trapped and abuses his wife, Biddy. Spurred on by a misguided belief that the Phelans got the best of him in a loan to buy land, he keeps vigil at a fence post plotting revenge …