Two crews return to Titan. Who will survive? Titan: The largest moon of Saturn. A deadly enigma harboring the greatest secret in the history of humankind. In the wake of the first mission, two companies with very different goals plot a return to that distant moon. Their ships are safer, their technology has improved...and they want answers. The competition triggers a new space race that will push the crews to the very edge of survival. Yet Titan does not hold all the secrets. On Earth, a startling ocean discovery reveals that whatever created the alien artifacts has been to our planet before...and it's coming back.