Felix is a guinea pig with a problem: every night as he prepares to drowse off The Worrier appears on the edge of his bed. The Worrier is an irritating imp who fills Felix`s mind with so many troubling thoughts that poor Felix is up all night worrying about all sorts of terrible things. Will Felix ever be able to find a way to stop The Worrier from bothering him? Colorful mixed-media illustrations accompany the text.