A dark and mysterious being is out for the Princess of Friendship. Now it's up to the rest of the main 6 to put a stop to their best friend's cruel fate, and her plans on taking all of Equestria down with her.
Pinkie pie is planning to throw the very best birthday party of the year. Only, how is she possibly going to succeed if the special somepony won’t even tell how old she’s turning? Naturally, a thorough investigation must ensue.
