Tinker Bell is curious by nature and she journeys into the Winter Woods which are forbidden to cross by fairies, but she wants to know why her wings glow and what the book written by the Keeper (who lives in the Winter Woods) knows about it.   She discovers she has a sister, a Winter Fairy named Periwinkle.  Their adventures together start a chain of events that may threaten the Pixie Dust Tree in Pixie Hollow itself.  SECRET OF THE WINGS is an enjoyable and fun movie for the entire family with plenty of adventure and heart for all ages.   It expands on the mythos of the land where Tinker Bell lives and the various characters are people you can feel for.  Not bad for an animated film that is only 67 minutes (not including the 8 minutes of credits) that is thankfully light on Disney songs except one or two.