An infamous crew of thieves almost pulls off the perfect jewel heist, except one thief - with a Navy SEAL tattoo identical to Jane's - is captured at the scene of the crime. Does this man know Jane? Meanwhile, Jane receives a visit - and an ambiguous warning - from the mysterious bearded man from her first memory as Weller and Mayfair struggle with Jane's role on the team.

Patterson and her puzzle-expert boyfriend, David, decode a tattoo clue that sends the team to the Centers for Disease Control (CDC). While at the CDC, the team discovers a hidden message on Jane's body that uncovers a plot that could have catastrophic global consequences. Meanwhile, Jane and Weller grow closer.

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.

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.

Jane and Weller go undercover as a world-class assassin couple to prevent deadly information from getting into the wrong hands. The intimate assignment draws them closer than ever. Meanwhile, David embarks on a solo mission to win Patterson back, and Carter clashes with Mayfair over how to handle a dangerous individual.

In the thrilling mid-season finale the team goes after a group of sleeper spies that have just been activated and race to stop a slew of assassinations.

Turn off your mind, relax and float down stream...it is not dying...it is not dying.