When her father dies, Kay Wilkinson can't cry. Over ten years, Alzheimer's had steadily eroded this erudite man into a paranoid lunatic. Surely one's own father passing should never come as such a relief. Both medical professionals, Kay and her husband Cyril have seen too many elderly patients in similar states of decay. Although healthy and vital in their early fifties, the couple fears what may lie ahead. Determined to die with dignity, Cyril makes a modest proposal. To spare themselves and their loved ones such a humiliating and protracted decline, they should agree to commit suicide together once they've both turned eighty. When their deal is sealed, the spouses are blithely looking forward to another three decades together. But then they turn eighty.