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The Gurus came in peace, bearing gifts.

They were a highly advanced, interstellar species who brought amazingly useful and sophisticated technology to the human race. There was, of course, a catch. The Gurus warned of a far more malevolent life form, beings who have hounded the Gurus from sun to sun, planet to planet, across the cosmos. Pundits have taken to calling them the Antagonists - or Antags - and they have already established a beachhead on Mars. In exchange for all they've done for us, the Gurus would now like our help.

Enter Master Sergeant Michael Venn, a veteran Skyrine (a Marine who is specially trained for off-world combat) who is dropped onto the Red Planet with his band of brothers on a mission to take down as many Antags as possible.

But from the moment they're dropped through the thin Martian atmosphere, their mission goes horribly, terribly wrong. From a group of female special ops Skyrines with secret orders, to mysterious humans who've settled on Mars, to the overwhelming and highly-reinforced Antags themselves, Venn and his brothers will face impossible odds just to survive - let alone make it home alive.

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.

Killing Titan is the second book in the epic interstellar War Dogs trilogy from master of science fiction, Greg Bear.

After the revelations on Titan about what the supposedly benign alien Gurus are really up to, Master Sergeant Michael Venn now has a whole new war on his hands.

As the Antag invasion wreaks havoc in the distant reaches of the solar system, Venn voyages towards the battle that could decide the fate of not just the human race, but that of the whole galaxy.

It's here that Venn will finally understand his destiny and that of every intelligent being in the solar system - including the enigmatic Gurus.

Take Back the Sky is the climactic book in the epic interstellar War Dogs trilogy from master of science fiction, Greg Bear.