"Brian" (Paul Mescal) has recently returned to his family home on the west coast of Ireland to a warm welcome from his mother "Aileen" (Emily Watson) and a largely indifferent one from his father "Con" (Declan O'Hara). For reasons we are not told, he has returned from Australia and is soon determined to pick up his ailing grandfather's oyster farming business. Despite knowing very little about this, he knuckles down and with the help of some "borrowed" half-grown's from the seafood factory where his mother works, seems intent on making a go of things. All is set fair until one evening, "Aileen"...