As the crew of the Roanoke shifts into a common habitat ring, optimism begins to return. Ian plans an unorthodox mission to map the environment and Sally tends to her new patient, who is now identified as a war criminal. But, back on the Roanoke Rachel's secrets build as she finds it increasingly difficult to hide from the others what she is doing on the haunted ship. And, while Sally discusses their situation with Pruit, she makes an extremely unwelcome discovery in her medical kit.