Riley had to face is to move the family to another city. The change was made five emotions that are running in her head (happiness, sadness, anger, fear, loathe) the fall in the commotion as "happy" and "sad" are straying from the control room into. Deep thoughts and mechanism of action of others in Riley. The two must work together to make their way back. But collaboration is harder than you think because of the "pleasure" to be optimistic and friendly to everyone. But since Riley was young she looked "sad" and a deep sense of wonder that is a useless emotion. Because we are sad to life to do well.