When an assassination leads the team to a dangerous app that allows criminals to track government vehicles, they have to work with the app's surprising creator to take it down. Jane and Weller attempt to keep their relationship professional. Zapata struggles with a moral issue.

After a disturbed Iraq War vet shoots up a military base, the team exposes a sinister plot. As Jane and Weller race to stop a single-minded scientist, Jane recalls her own mysterious military past and contemplates a new relationship with Oscar.

The FBI is locked down when criminal hackers infiltrate the building, trapping the team inside SIOC. As they fight their way out, the close quarters force Mayfair, Zapata, Reade, and Sarah to confront personal conflicts.

Weller and the team must race the clock to stop a series of escalating New York City bombings, while Jane is forced to go on an assassination mission to prove her loyalty... or suffer the consequences.

With Nas's help, Weller and Jane finally come face-to-face with Nas's inside source within Sandstorm, and square off with an old foe.

Jane and Weller go undercover on a high-stakes scavenger hunt run by powerful hackers. Shepherd journeys to Thailand to procure a dangerous weapon.