David S Goyer & Michael Cassutt - Heaven's Shadow Series

Heaven's Shadow series
Book 1 Heaven's Shadow by David S. Goyer and Michael Cassutt
Three years ago, an object one hundred miles across was spotted on a trajectory for Earth's sun. Now, its journey is almost over. As it approaches, two competing manned vehicles race through almost half a million kilometers of space to reach it first. But when they both arrive on the entity, they learn that it has been sent toward Earth for a reason. An intelligent race is desperately attempting to communicate with our primitive species. And the message is: Help us.

Book 2 Heaven's War by David S. Goyer and Michael Cassutt
When an unidentified object is spotted hurtling towards Earth, two rival teams race to claim it. But the affectionately-named Keanu conceals astonishing and dangerous secrets. Instead of barren rock, astronauts discover a giant ship with an extra-terrestrial crew. A ship that had headed to Earth with a mission and a message: Help Us. A brave new frontier beckons, but we are about to learn that it comes with a price. Without warning or explanation, small groups of humans are transported from the competing scientific communities of Houston and Bangalore to the vast interior habitats of Keanu. Their first task is to stay alive. Their second, to explore the potential of their strange new home and locate their keepers. But most significantly of all, as the ship starts to break down around them, they must figure out why they were brought here and forge a path home.

Book 3 Heaven's Fall by David S. Goyer and Michael Cassutt
Twenty years have passed since the mysterious Near-Earth Object nicknamed Keanu appeared in the night sky and transported an assortment of humans from all over Earth into its interior. There they discovered that Keanu was an immense long-range spaceshipand they were not its only inhabitants. They joined forces with the aliens called the Architects, who had come from a distant galaxy to seek help in fighting the vicious Reivers. And they defeated themor so they thought. Now Keanu has reestablished contact with Earthand discovered that the Reivers have, in fact, taken over the planet, placing most of the population under their dominion. A few scattered pockets of humanity, constantly in danger of being assimilated, have mounted a resistance