Sunset knew something was wrong when she woke up in Twilight’s castle since she had no recollection how she even got there. She soon discovered that Twilight was missing and nobody seemed to remember who Twilight was. But that was the least of her worries when she found out she has become an alicorn princess and may have taken over Twilight's life. With no clue as to where Twilight was or why they had switched roles, Sunset was determined to find Twilight. With the help of Spike and Twilight’s friends, Sunset set out to find her presumed missing friend.

Special thanks to editors/proofreaders:
The Albinocorn
Dreagknight