When Olivia attempts to blackmail Mary, she is drawn deeper into a deadly game of cat and mouse.

Mary and Ben join forces; Travis reveals a crucial detail about Ben's investigation.

Following the disappearance of Travis, Des worries that he and Mary may have crossed a moral line from which they can never return. After jeopardizing Ben's investigation of Olivia, Mary tries to make amends, which has repercussions for a patient in dire need.