This a biography of Dorothy McKibben, whose office at 109 Palace Street in Santa Fe, New Mexico was the entry point for all persons going to Los Alamos during World War II. It traces her journey to Santa Fe to recover from tuberculosis in 1925, the birth of a son, and the death of her husband. In 1943 she was recruited by physicist J. Robert Oppenheimer to establish the office that became the clearinghouse for all travelers to Los Alamos. The author provides interesting details of McKibbin's work and her relationships with a broad range of people associated with the project, especially Oppenheimer.