Not My First (Space?) Rodeo

Transported to an alien world, a young soldier and his family are forced into servitude and must fight for survival, in this action-packed SF adventure.

Shad Williams joined the army to fight for his country, not to fight aliens. But when he's abducted through a portal along with his terminally ill grandfather and kid sister, that's exactly what he finds himself doing.

Now, deep below the surface of the planet Ganymede, they find themselves with other equally confused groups of humans drafted into serving under extraterrestrials battling for control over the Reality Engine, an advanced supercomputer capable of producing miraculous resources and technologies. Forced to undertake quests to survive, Shad's family encounters odd pairings of monstrous creatures and dangerous people ripped from Earthly mythology, history, and pop culture. With every victory, they level up superhuman skills and magical abilities beyond imagination. Classified as a Gunslinger, Shad's quick reflexes and dead-shot accuracy make him a warrior without peer.

But as Shad's family makes their way through voodoo zombies, dinosaurs, and Al Capone's gangsters on one deadly mission after another, their real enemy continues to exploit them. To save his loved ones--and all of humanity--Shad must band with his fellow kidnapped Earthlings to take the fight to their alien captors and seize the Reality Engine for themselves . . .