After a seemingly straightforward hostage situation turns out to have deeper international implications, the CIA and FBI find themselves racing against each other to apprehend the same criminal with a dark history. Carter expresses concern about Jane's trustworthiness, causing friction with Mayfair and testing Reade's loyalty to the team. Meeting Weller's family proves overwhelming for Jane as she grapples with her identity.

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 police officer is murdered, Patterson unlocks a disturbing tattoo that appears to have predicted his killing, and the team chases a violent clue trail to stop further attacks. Mayfair reveals secrets from her past to Weller, seriously testing their relationship.

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.

After an armored truck is robbed, the team discovers that the stolen goods are chemical weapons and they must race to thwart a terrorist plot. Meanwhile, Jane grapples with a confusing memory of Weller - while growing even closer to Oscar. Meanwhile Patterson receives a phone call from someone from her past.

After Patterson discovers a hidden message in the New York Times crossword, she embarks on a tattoo scavenger hunt that leads her into danger. Oscar finally tells Jane more about who she was, and Weller seeks his Dad's opinion about who kidnapped Taylor Shaw.

In order to capture a dangerous international criminal, Jane and Weller are forced to collaborate with the only person he will meet: their former target, Rich DotCom. Jane must decide whether to risk hurting Weller by executing a morally questionable order from Oscar.

When a school shooting breaks out during the investigation of a tattoo, the team splits up to take down the shooter. Mayfair copes with some issues from her past.

After an abandoned baby is found with a tattoo identical to one of Jane's, the team races to piece together the child's identity and save dozens of infants. A furious Jane confronts Oscar about the outcome of his secret missions.

When Jane is shot and Weller is kidnapped, the team must fight to save both of their lives while maintaining the secrecy of their hidden base. Meanwhile, Weller is haunted by some dark ghosts from the past.