Edmond makes a startling revelation about what happened to his father. David's son only wants to speak to one person, whom no one seems to know. Francis raises doubts about Sarah's true intentions.

The squad tries to unravel the mystery of David's last mission in space. Francis threatens Sarah, saying he'll reveal what he knows to the police. The name Terrence Steben triggers a reaction from Brenda Nichols, but she claims she can't help the investigation.