Twilight receives an anonymous letter, which arrives at her door via Derpy Hooves. Most ponies never get random invitations to places they've never been to, especially from unknown strangers. It's hard to piece together whether the sender requests a duel, a friendly meeting, or something else entirely. Would a curious mare like Twilight Sparkle be able to? This young mare has no choice but to take up the offer. What lies at the end of the cliff, is a pony that calls itself ''anonymous'', and something that may haunt her for months to come.