The Mercury is tracking down its stolen shuttle. They find it abandoned and drifting in space. The team devises a plan to capture it and find something unsettling. In San Antonio Sam meets with Bishop to discuss some of the details of Bishop's mission and how Sam is going to be used. In Houston, Tracy's team studies possible targets while Corsky is en route. Scarlett in the meantime has made a startling discovery about the possible Pentagon mole.