In Yalda's universe, light has no universal speed and its creation generates energy.
On Yalda's world, plants make food by emitting their own light into the dark night sky.
As a child Yalda witnesses one of a series of strange meteors, the Hurtlers, that are entering the planetary system at an immense, unprecedented speed. It becomes apparent that her world is in imminent danger -- and that the task of dealing with the Hurtlers will require knowledge and technology far beyond anything her civilisation has yet achieved.
Only one solution seems tenable: if a spacecraft can be sent on a journey at sufficiently high speed, its trip will last many generations for those on board, but it will return after just a few years have passed at home. The travellers will have a chance to discover the science their planet urgently needs, and bring it back in time to avert disaster.
The Clockwork Rocket is the story of Yalda and her descendants, trying to survive the perils of their long mission and carve out meaningful lives for themselves, while the threat of annihilation hangs over the world they left behind.
Exiled exorcist Lucian Negru deserted his lover in Hell in exchange for saving his sister Catarina's soul, but Catarina doesn't want salvation. She wants Lucian to help her fulfill her dark covenant with the Fallen Angels by using his power to open the Hell Gates. Catarina intends to lead the Fallen's hordes out of Hell and into the parallel dimension of Woerld, Heaven's frontline of defense between Earth and Hell.
When Lucian refuses to help his sister, she imprisons and cripples him, but Lucian learns that Rachael, the lover he betrayed and abandoned in Hell, is dying from a demonic possession. Determined to rescue Rachael from the demon he unleashed on her soul, Lucian flees his sister, but Catarina's wrath isn't so easy to escape.
In the end, she will force him once more to choose between losing Rachael or opening the Hell Gates so the Fallen's hordes may overrun Earth, their last obstacle before reaching Heaven's Gates.