Marcus leads a search for three missing crew members of the Colorado, a search that leads them to Serrat's compound, where they receive an ominous demand. Meanwhile, a clandestine meeting between Kylie and Admiral Shepard confirms that the order to fire came through a back channel.

In an attempt to end the standoff on Sainte Marina, Marcus and Sam enter into tense negotiations with the U.S. Government. Meanwhile, when a critical system fails, Grace must take command of the Colorado on a perilous repair operation.