Prime Target features a brilliant young math postgraduate, Edward Brooks, who is on the verge of a major breakthrough. If he succeeds in finding a pattern in prime numbers, he will hold the key to every computer in the world. Soon, he begins to realize an unseen enemy is trying to destroy his idea before it's even born, which throws him into the orbit of Taylah Sanders, an NSA agent who's been tasked with watching and reporting on mathematicians' behavior. Together, they start to unravel the troubling conspiracy Edward is at the heart of.

Cambridge student Edward Brooks starts working on a secret research project that triggers unthinkable chaos.

Ed's work catches the attention of NSA operative Taylah Sanders and a mysterious institute.

While retracing Safiya's steps, Ed uncovers chilling pleas from the past. Taylah tries to earn Ed's trust.

Ed digs deeper for clues at the institute. Andrea navigates devastating news in Baghdad. Taylah reconnects with leadership.

Ed and Taylah join Andrea in Baghdad, where they unearth ancient, buried answers—and get caught in the crosshairs of an unknown enemy.

As the NSA trails their every move, Taylah and Ed race to track down the final piece of the puzzle.

Ed is coerced into completing his work. Taylah considers an ultimatum. An ally gets trapped in the middle of the mayhem.

Season finale. As Ed and Taylah try to expose the truth, a deadly threat is discovered to be closer than they could have imagined.