Cassie didn't mean to steal Bianca's glasses.  But when she does, she finds a world of fairies that she didn't know existed.  The glasses let her see fairies, although she can't hear them or touch them.

She knows she has to give the glasses back.  But when she finally gets up her courage to return them, Bianca doesn't know what she's talking about.

Who do the glasses really belong to?

And what will happen when she tells her parents that fairies exist?