When an airplane disappears over the Atlantic, Howard Lawson of the TSIB chooses Kendra Malley to lead the investigation, even though she's still on bereavement leave. As a potential crash site is identified, Kendra discovers the pilot kept a secret.

The hunt for wreckage continues as the TSIB team learn more about Donovan. Kendra wonders if the plane's lone survivor is hiding something.

Kendra gets an important clue from Madelyn; a friend of Captain Donovan's appears at the TSIB offices and reveals he was agitated and unstable the night before Flight 716 took off; AJ obsesses over an online conspiracy that blames a Russian oligarch.

Kendra tries to make sense of conflicting evidence and is stunned by the betrayal of someone close to her; AJ puts his life in danger.

AJ is injured but alive after his accident; after being attacked, Kendra uncovers a stunning betrayal by someone close to her; a second attempt at reaching the black boxes reveals a new layer to the mystery.

After recovering the black boxes, Kendra investigates Hoffman and brings the full story of the Flight 716 disaster to light.