Tom claims he is innocent and wants to turn the box into the FBI; Red's next target is a beautiful and deadly corporate terrorist (Margarita Levieva).

Red and Liz work with the taskforce to stop a negotiator who has resurfaced to unite two rival crime families. Tom reconnects with a former flame.

After a missing child that has been presumed dead turns up alive, Red and Liz work with the taskforce to search for a dangerous woman who may be kidnapping children. Meanwhile, Tom faces shocking consequences after his plan to help Liz goes awry.

After Red learns that a tactical nuclear weapon is being targeted by thieves, it's a race against the clock as the task force struggles to stop them -- and prevent an imminent nuclear disaster. Meanwhile, Tom and Liz make a decision that will change their relationship forever.