Supremacy - SUPREMACY SERIES Book 1

The World is DividedFor centuries, two types of humans have lived on Earth in secret: the Surfacers, who live above ground, and the Hallows, who live below. The Hallows have always watched over the Surfacers, whom they consider to be destructive and audacious. They have used their advanced technology to control the natural world, causing earthquakes, floods, hurricanes, volcanic eruptions, and droughts as needed to keep the Surfacers in check.
But now, the Hallows are growing increasingly unhappy with the way the Surfacers are treating Earth. They believe that the Surfacers are destroying the planet, and they are determined to take action. They plan to kill everyone who lives above ground, so that they can ensure their own survival below. It will take one Hallow and one Surfacer to stop this purge. Lucas, a 19-year-old Hallow who is trained to defend, protect, and kill, is given the mission to head up to the surface, blend in, and find the Surfacer who will team up with him to save the world.
Kate Parker, a 17-year-old Surfacer who lives in Texas, is the one person who can help Lucas. She has a secret that no one else knows: she has a photographic memory. She can remember everything she sees and hears, which makes life easy for her. But she has no idea that this same ability will allow her to save the world. Lucas and Kate must work together to stop the Hallows from carrying out their plan.
They must race against time to find a way to bridge the divide between their two worlds and save humanity from extinction.