A solarpunk murder mystery. A murder, a disappearance, and a seemingly infallible AI… The year is 2504, and sprawling eco-cities built over the ruins of fallen metropolises have created a haven for the people. In the most prosperous areas of the world, skyscrapers bursting at the seams with vibrant green life and towering turbines litter the cityscapes. Heliopolis is one such supercity, renowned for its spectacular architecture, sun-drenched climate, and numerous natural reserves. But beyond this futuristic utopia lies a darkness: the Ruins. Cities, long abandoned, crumbling and wild, where the forsaken survive on the waste of the flowering megalopolises beyond. When businesswoman Cassia Grove is found murdered in her home, even PATET can't help the police solve this mystery. It isn't long before the investigation reveals a sinister link between PATET and the devils which dwell in the Ruins. But is it too late to stop them?