A young hippogriff student begins attending the School of Friendship. Her roommate is annoying, she can't stop thinking of home, and horrors hidden in the dark are beginning to reveal themselves.
Terror begins after Twilight and her friends make a horrifying discovery during a trip to the castle of the two sisters. Now trapped within the ruined castle, they swiftly learn the darkness is the last thing to fear.
An ancient evil has once again risen from the shadows. Will Twilight and her friends stop it? ... Or will they crumble one by one in front of this unseen foe...