The people of the planet Aeon, blessed with six suns, have never experienced night. When an archeological excavation uncovers evidence of an ancient catastrophe, all signs point towards the impending darkness of the very first Nightfall. Panic erupts as the suns slowly disappear one by one. Science struggles against superstition as the people race to comprehend the approaching Nightfall... the end of the world as they know it. Based on Isaac Asimov's classic story "Nightfall," voted "The Greatest Science-Fiction Story OF All Time."

Detective Klaski investigates the death and mutilation of three men and soon crosses paths with Remy, an entomologist. Soon, he discovers that she is being stalked by a giant shape-shifting insect who is bent on taking over New York.

The secret US abduction of a suspected terrorist from his Middle East homeland leads to a wave of terrorist attacks in New York. An FBI senior agent and his team attempt to locate and decommission the enemy cells, but must also deal with an Army General gone rogue and a female CIA agent of uncertain loyalties.