This is a good, solid little series.  The basic premise is a brother and sister who have a magic mirror in their basement that lets them slip through into the land of fairy tales.  While there, in an effort to make things better, they realize they’ve actually interfered in some way that will get in the way of reaching happily-ever-after, so they’ve to to work to put things back on track.  In this one they climb up Repunzel’s braid to visit, but Jonah forgets he’s wearing his soccer cleats, which shred her hair.  I like that the stories are accessible to young readers: enough background explanation is woven into the text so that readers can pick up any book in the series and not worry about reading them in order, and the basics of the original fairy tale are included in case they’re not familiar with it.