Tell me a riddle (1980)

Aging couple David and Eva have lost the spark that once infused their marriage. After nearly four decades together, the elderly duo is feel disconnected and lost. When they discover that Eva is sick, they decide to travel across the country to stay with their granddaughter in San Francisco. On the trip, with Eva's possible death looming, the couple rediscovers the passion and love that had been missing from their lives.