The perfect gift for sci-fi fans!
The first five books of the post-apocalyptic Phantom Series in one unbeatable package:
The Phantom of the Earth (Books 1-5 Omnibus Edition) by Raeden Zen

In the Great Commonwealth of Beimeni, a subterranean civilization in North America, expansion long ago gave way to peace and prosperity in the face of the history’s most devastating plague. Immortality is the reward for service and loyalty in Beimeni, a place where the physical blends with the metaphysical and power consolidates in the hands of those with a genetic edge. The fissures first spread slowly, then swiftly, until now the Great Commonwealth finds itself on the brink of economic devastation, challenged by forces from within that know its secrets and its crimes. At the center of the conflict lie the Selendias of Piscator, founders of the resistance with an uncanny connection to the zeropoint field, and the Barão Strike Team, three researchers tasked with finding a cure to the Reassortment Strain, the plague that nearly wiped humanity from the Earth. Traveling from the uninhabitable but pristine surface to the habitable but inhospitable underground, this is a story about dedication to dreams, battle for survival, discovery and connection, song and celebration, undoing past misdeeds, and sacrifice for the greater good.