Kendra Malley is called to the U.S. to investigate a high-speed train crash in rural Michigan.

Kendra learns about a mysterious passenger on the run after escaping from U.S. Marshals' custody.

Kendra shares information with her FBI counterpart; Kendra gets a big break in the case.

Kendra looks for connections between the victims; Max and Kendra hatch a plan with the FBI.

Kendra and Agent Hunter find proof of a larger conspiracy; a confrontation leaves Kendra shaken.

As the case winds down, Kendra feels there's still a missing piece of the puzzle.