The third tells of Grace's first mission to Casablanca, as she competes against George S. Patton to retrieve Gideon's gold ring.

The first part recounts the story of Gideon Cahill and Damien Vesper, and the inception of the empowering serum made of 39 ingredients.

During the night, before they can leave, Vesper's comes in search of the serum; but the Cahill sets off an explosion in his laboratory.

The house is set on fire, yet all four of Gideon's children: Luke, Jane, Thomas, and Katherine; plus his wife, Olivia, survive.

The children quickly begin blaming each other for the fire and leave in two separate groups: Luke and Jane, and Thomas and Katherine.

Grace, a thirteen-year-old girl, troubled with raising baby Fiske, the disappearance of her father James, and the death of her mother Edith, receives a Morse code transmission telling her to go to Casablanca, to find General George S. Patton, leader of Operation Torch, to find Gideon's ring in "bulls-eye".

Amy and Dan's normal lives take a dramatic turn when Uncle Fiske reveals to them that Grace's ring is hidden in Switzerland.

They find the ring, but are attacked by Vesper spies, and escape with the help of Fiske's friend Erasmus, a fellow Madrigal, and they return to Boston, aware that they must prepare if they are to defeat this new threat.