Take back the sky War dogs series, book 3.

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,...