Whenever Angelina invites Alice over to play, Polly always gets in the way. So this time, Angelina suggests that they all play hide-and-seek, Polly's favorite game. Once Polly is hiding, Angelina and Alice go off and play by themselves. But when Angelina goes to collect Polly, she can't find her sister. Come along as Angelina learns a lesson about what responsibility really means.