Some connections are lost, but some new ones are forged. Chris climbs out of a hole and Nadia throws a party. And one of the longest-held mysteries of this entire adventure is finally explained...  

The mysterious voice does indeed turn out to be an important person. Chris and Mac work on an idea that may change the whole world for the better, and meanwhile Prithvi is doing the same! And the day Chris has been dreading for years ... has arrived.

Can Marcus and Sophia -- with help from Nadia -- get Chris back inside the ship before all of his air vents out into space? Can Mac be persuaded to look for something every other scientist on Earth has missed? And could Dr. Mason finally be losing his one and only mind?