When a mysterious message leads Saanvi to the flight attendant of 828, she enlists Ben's help in uncovering a secret about the plane. Meanwhile, Michaela begins to question the nature of the callings when one goes horribly awry, leaving Jared to suffer the consequences.

When Cal wakes with a life-threatening fever, Grace worries it's a side-effect of his experimental cancer treatment, but Michaela and Ben suspect Cal's condition may be related to a mysterious passenger from Flight 828. As Cal's situation worsens, Ben and Michaela attempt to track down the now-missing passenger.