A sickness is in the air.

A sense of doom has slowly infiltrated every corner of the Skylight System. Something ancient and evil has returned. Can Jet Stroud and the Lucem survive this new challenge, or will it usher in their final chapter?

Once again, the Lucem are isolated as civil war begins. Forces are realigning after the discovery of the Heliographi Memoirs. But Jet knows their victory means little in the greater scheme for the control of Skylight.

The return of an evil presence sends ripples throughout the system, one thought to have been expelled from existence. As this 'evil presence' begins to reveal itself, bizarre events unfold, and untold prophesies come to light. Jet grows concerned at what he might have unleashed during the third phase of the Prism Effect.

Jet's ever-deepening connection with ghosts from his past has set him on a treacherous path, one that he fears to follow. He struggles with his special 'gift' to unlock the secrets of his appointed quest, one that may decide the fate of the human race.

As the prophesied Fulcrum Wars begin, will the fourth phase of the Prism Effect reveal itself? If it does, what will it bring? Death to the human race?

...or salvation?