Graham Shiels

The team investigate a ransom case involving a marine's daughter during Halloween; Tony and McGee are stunned by Abby's costume.

Injured and framed for a string of murders, Colter, cut off from Reenie and Randy, must rely on an unexpected ally, Billie, to stop a relentless assassin, uncovering a murky truth where justice and vengeance blur.

The CBI team investigate the death of a documentary filmmaker. As they make links to an older murder case, Jane is taken hostage by the prime suspect.

Brenda is investigating the murder of a US congresswoman's daughter when she unveils classified information which endangers her life.

Kensi and Deeks search for three Marines who go missing after an ambush; Nate returns from his mysterious assignment.

A hacker tries to interfere with the presidential election, causing chaos for Team Scorpion as they try to sort out the mess.