The novel “Killing Titan” by Greg Bear was published for the first time in 2015. It’s the second book in the War Dogs trilogy and follows “War Dogs”.
After a mission to Mars during the war against the aliens known as Antags (Antagonists), Michael Venn is in isolation in a sort of quarantine because he’s told of the fear that he and other Skyrines – Sky + marines – were contaminated. After being questioned about what they found on Mars, he fears that there’s nothing good for him in his future.
When he’s expecting the worst, Michael Venn is freed by a woman who explains to him that there are humans who don’t accept what was told them by the aliens known as the Gurus. To hope to discover the truth about the war in the solar system, Venn will have to go back to Mars but this time it’s just a step in a longer journey.