Credo and Equity set out to solve crimes in Equestria. Instead however, they come across a mystery that will change the future of their country forever. With the help of their friends, they aim to get to the bottom of things and put a stop to them.

Star Spade and fifteen other ponies have all been imprisoned in a strange building that none of them have seen before by a strange pony named Monoruto. If they want to leave, they must commit the perfect murder.