1942: THE RACE IS ON TO CREATE THE ATOMIC BOMB.

James Nessheim has gone back to college and thinks he has left his life as a spy behind.

But the covert nuclear programme at the University of Chicago has been infiltrated by an enemy agent, and Nessheim is persuaded by the FBI to help track him down.

At the same time, an old flame re-enters Nessheim's life and he finds himself falling in love. But can it be coincidence that she appears just as he becomes a special agent again?

Nessheim's personal and professional lives grow dangerously intertwined as he struggles to protect the war's deadliest secret - and work out who he can trust.