This year, when Grandpa puts Caspian's special Unbirthday box under his bed, it's empty. Grandpa insists that he has given Caspian an Invisible Magic Wand® Caspian has to name it before it will work. "Maybe," says Caspian. "Good name," says Grandpa. "Nobody will get suspicious." Caspian's hand tingles. Caspian learns how to squeeze time, so he can move quickly and how to stretch time so he can make things he enjoys last.