Unearthed Series by Amie Kaufman, Meagan Spooner

When Earth intercepts a message from a long-extinct alien race, it seems like the solution the planet has been waiting for. The Undying's advanced technology has the potential to undo environmental damage and turn lives around, and Gaia, their former home planet, is a treasure trove waiting to be uncovered.For Jules Addison and his fellow scholars, the discovery of an alien culture offers unprecedented opportunity for study.. moreWhen Earth intercepts a message from a long-extinct alien race, it seems like the solution the planet has been waiting for. The Undying's advanced technology has the potential to undo environmental damage and turn lives around, and Gaia, their former home planet, is a treasure trove waiting to be uncovered.For Jules Addison and his fellow scholars, the discovery of an alien culture offers unprecedented opportunity for study... as long as scavengers like Amelia Radcliffe don't loot everything first. Mia and Jules' different reasons for smuggling themselves onto Gaia put them immediately at odds, but after escaping a dangerous confrontation with other scavvers, they form a fragile alliance.In order to penetrate the Undying temple and reach the tech and information hidden within, the two must decode the ancient race's secrets and survive their traps. But the more they learn about the Undying, the more their presence in the temple seems to be part of a grand design that could spell the end of the human race... less

Earth's fate rests in their hands. Trapped aboard the Undying's ancient spaceship and reeling from the truth they've uncovered, Mia and Jules are desperate to warn their home about what's coming. After a perilous escape in an alien craft, they crash-land on Earth's surface only to realize the awful truth: No one believes in the Undying threat in orbit... moreEarth's fate rests in their hands. Trapped aboard the Undying's ancient spaceship and reeling from the truth they've uncovered, Mia and Jules are desperate to warn their home about what's coming. After a perilous escape in an alien craft, they crash-land on Earth's surface only to realize the awful truth: No one believes in the Undying threat in orbit. With no choice but to take matters into their own hands, they must escape custody of the powerful International Alliance in order to discover the true mission of the Undying, and how to stop them. On the run, fugitive among their own people, they must journey across Europe to stop an alien invasion, prevent a horrific plague, and save the people they love.From the mountains of Spain to the streets of Prague, the epic conclusion to the Unearthed series is a white-knuckle ride that will keep readers guessing until the final page. less