Page 150: But Donovan had changed his mind about Eifler's fitness for the mission, worried the man's loose-cannon style could draw unwanted attention to the delicate operation. He gave the job to a 41 year old baseball player named Moe Berg.
We broke the secret!
Page 151: Berg was soon assigned to a secret operation, code-named Alsos
Page 152: Berg spent time in London studying atomic physics.
Page 152; Berg traveled to Switzerland to hear Heisenburg's lecture at Zurich University.
Page 152: Berg showed up at a dinner party at a physics professer's house in Zurich. He spotted Heisenburg inside, surrounded by party guests.
Page 153: Berg introduces himself to Heisenburg and finds so evidence of an atomic weapon.