Pound Cake and Flurry Heart have been friends with benefits for years, and "friends" is exactly what both of them claim they're happy being. They're both lying—and their families are going to drag the truth out of them, one way or another.
While Spike has a night out with his siblings, Flurry Heart and her friends have a sleepover in the now-renovated Harmony Clubhouse tree, but their bickering welcomes in a very powerful ghost that seeks to turn them all against one another.
While Flurry Heart and her friends are vacationing in Southern Equestria, they meet Somnambula who is studying clues leading to a mysterious temple where she finds an old friend.