This story is a sequel to My Brave Pony: The Knight Who Fell From Space

It has been three months since Lightning Dawn and Krysta quite literally fell into Twilight's life, leaving quite an impression on her before departing as swiftly as they had come. In that time, in amongst the hectic life she leads in Ponyville, Twilight has been searching for a way to contact her two lost friends. Finally, she thinks she has found it: the Heart of the World, a legendary being of unknown kind but which, if the tales be true - and when are they now where Twilight and her friends are concerned - had the ability the communicate with other beings across space. If Twilight can find the heart, she might be able to contact Lightning and Krysta, perhaps even help them return to Equestria.

So, with her faithful friends by her side, Twilight sets off on a journey deep into the heart of zebra country, searching for a way into to the bowels of the earth where the Heart of the World is said to dwell. The journey will not be easy: zebra warriors, hidden defences and the malice of the mysterious Raven will dog the steps of Twilight and her companions. But at the end of the journey, at the Heart of the World, Twilight might just find a way to mend her own aching heart.

Twilight Sparkle has been living in Ponyville for almost a year now, and the long-awaited Grand Galloping Gala is just a few days away. But three strangers have come to Ponyville, bringing with them the promise of great change.

One is the enigmatic Raven, who reveals little of herself beyond vague generalisations but who appears to have some history with Twilight and her friends, even if none of them can ever recall meeting her before.
Making much more of a bang, literally, are Prince Lightning Dawn and his sister Krysta; together they bring astonishing revelations about the history of Equestria, while Lightning also brings a stick lodged in his posterior. But Twilight can see something underneath his often unappealing manner, and as he bends towards her she begins to wonder just what it is she might be feeling towards this stranger from the stars.

Can Twilight open Lightning's eyes to a whole new world, and whole new way of living beyond the grim austere demands of duty and necessity? Or will Lightning's nature drive away not only Twilight but also his best hope of salvation?

Unbeknownst to either of them the fates of worlds and stars and even an entire galaxy are bound to these two, the virtuous princess and the half-made knight; and their journey has just begun.