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.

The squad must act quickly as Sarah and Edmond find themselves in danger. Stephanie insists on sharing the results of her investigation with Lamontagne. Brady leads the police to a location of great importance.