The streets of the city are dark and deserted, and an icy stillness hangs in the air. Winter, like an invading army, has driven the people indoors to escape the biting winds which are cold enough to crack the pavement. There is darkness and silence, but suddenly one is aware of a square of light on the snowy sidewalk. It comes from a store window, and the sign says 'Garcia's Grocery'. Why is it open at this hour of night?