What was supposed to be a joyous occasion at Lightning's Mansion with Twilight and the Mane 6, Cadance, Shining Armor, and all of Ponyville takes a dark twist when tragedy strikes. Through laughs and moments of joy, the festive atmosphere shatters as suddenly Lightning's dead body tumbles from the grand balcony that overlooks the big lobby. Panic breaks out, and every guest in attendance is a suspect, including Twilight and her friends.

Now, they have to unravel a web of secrets and lies to get the answers to three basic questions: Who did this vile act? Where in the mansion did it happen? And with what instrument was Lightning killed with? The time factor is running against them, as with every minute, somebody loses trust, and the tensions run high, which simply means they must solve this mystery before the murderer strikes again. In a place full of shadows and hidden motives, can they unmask the murderer amongst them before it's too late?