Грег Бир - The War Dogs Trilogy

Collected in a single volume for the first time, the epic War Dogs trilogy of interstellar war from a master of science fiction.
The Gurus made their presence on Earth known thirteen years ago. Providing technology and scientific insights far beyond what mankind was capable of, they became indispensable advisors and promised even more gifts that we just couldn’t pass up. But they were followed by mortal enemies—the Antagonists—from sun to sun, planet to planet, and now the Gurus are stretched thin—and they need humanity’s help.
Our first bill has come due.
Skyrines like Michael Venn have been volunteered to pay the price. They face insidious enemies who were already inside the solar system, establishing a beachhead on Mars.
Venn and his comrades will be lucky to make it out alive—let alone preserve the future of all of mankind.
#1 - War Dogs
From a master of science fiction comes an epic interstellar tale of war. They came in peace, bearing gifts. The Gurus were a highly advanced species who brought amazingly useful and sophisticated technology to the human race. There was, of course, a catch. They warned of a far more malevolent life form, beings who have hounded the Gurus across the cosmos. The media have taken to calling them the Antagonists—or Antags—and they have already established a beachhead on Mars. For all they have done for us, the Gurus now need our help. Enter Master Sergeant Michael Venn, a veteran Skyrine who is dropped onto the Red Planet with his band of brothers on a mission to turn back the Antag tide. But the Skyrines will face impossible odds just to survive—let alone make it home alive.
#2 - Killing Titan
A new planet. A new battle. Same war.
After barely surviving his last tour on Mars, Master Sergeant Michael Venn finds himself back on earth in enforced isolation. Through a dangerous series of operations he returns to Mars to further his investigation into the Drifters—ancient artifacts suddenly reawakened on the red planet. But another front in the war leads his team to make the difficult journey to Saturn’s moon, Titan. Here, in the cauldron of war, hides new truths about the Drifters, the origin of life in our solar system and the plans of the supposedly benevolent Gurus, who have been "sponsoring" and supporting humanity in their fight against outside invaders.
#3 - Take Back the Sky
The conclusion to an epic interstellar trilogy of war from master of science fiction, Greg Bear.
Marooned beneath the icy, waxy crust of Saturn’s moon, Titan, Skyrine Michael Venn and his comrades face double danger from Earth and from the Antagonists, both intent on wiping out their growing awareness of what the helpful alien Gurus are really doing in our solar system.
Haunted by their dead and by the ancient archives of our Bug ancestors, the former combatants must now team up with their enemies, forget their indoctrination and their training, and journey far beyond Pluto to the fabled Planet X, the Antagonists’ home world, a Sun-Planet in the comet-generating Kuiper belt. It’s here that Master Sergeant Venn will finally understand his destiny and the destiny of every intelligent being in the solar system-including the enigmatic Gurus.