Exogenesis (Stargate Atlantis, #5)

The eye of the beholder…
When Dr. Carson Beckett disturbs the rest of two longdead Ancients, he unleashes devastating consequences of global proportions.
With the very existence of Lantea at risk, Colonel John Sheppard leads his team on a desperate search for the long lost Ancient device that could save Atlantis. While Teyla Emmagan and Dr. Elizabeth Weir battle the ecological meltdown consuming their world, Colonel Sheppard, Dr. Rodney McKay and Dr. Zelenka travel to a world created by the Ancients themselves. There they discover a human experiment that could mean their salvation…
But the truth is never as simple as it seems, and the team’s prejudices lead them to make a fatal error — an error that could slaughter thousands, including their own Dr. McKay.