Twilight is visiting Fluttershy's cottage, helping her out with spring cleaning. Twilight finds a book that Fluttershy doesn't want her to see, and a discussion between the two leads to Fluttershy revealing a secret to Twilight.
Fluttershy leaves her home, and Twilight follows behind her. It's what Twilight learns about the pony she meets that changes her outlook on her friend.