Berlin, 1938. Groundbreaking physicist Dr. Hannah Weiss is on the verge of the greatest discovery of the 20th century: splitting the atom. She understands that the energy released by her discovery can power entire cities or destroy them. Hannah believes the weapon's creation will secure an end to future wars, but as a Jewish woman living under the harsh rule of the Third Reich, her research is belittled, overlooked, and eventually stolen by her German...

Double agent Sydney Bristow faces the greatest challenge of her life when her mother, an enemy long thought dead, turns herself in to the CIA. As family relationships change and Sydney's friends take on new roles, her life becomes even more tangled and dangerous. Sydney fights to reclaim her life and the action builds to a spectacular climax.