In the long-forgotten past, the solar princess welcomed a black unicorn into Canterlot Castle. He was an artist who quickly found a place in the hearts of all who met him. His name, likened to the colour of his coat, was Midnight.

Nearly a millennium later, the discovery of an unusual book leads Twilight to Canterlot. And directly into a whirlwind of events where the secrets of the past are finally brought to light...even as all is eclipsed in madness...