Whilst doing some research based on information sent to them by Misty, Izzy and her father find references in old documents to something called the Lost Engine. Concerned that Opaline is keen to get her grubby hands on this as well, the team set off on a search for the Lost Engine, following myriad cryptic clues and strange documents on their way. But nothing is ever as it seems, as what seems like a grand adventure soon turns into a race against time as other powers make their intent known.

Loosely based on Secret of the Unicorn, with some stylistic elements lifted from the Uncharted games. Written as part of the 40 years of My Little Pony celebrations.