What was supposed to be a fun relaxing vacation with her friends in the crystal mountains turns into a short yet terrifying possibility of spending her days in prison

During a joint graduation party for the students of Canterlot High and Crystal Prep at Sour Sweets mansion. Sci Twi gets an e-mail back from the tests Sunset and Princess Twilight agreed to let her conduct on the genetic profiles only to discover that Sunset has human DNA and may not even be a true equestrian.