Dark Recess by George O. Smith — Read

Alone in his office at night, while the _Evening Star_ was starting the hike to Venus, Doctor Hanson sat thinking. He was piecing it together; and it was like playing with a jigsaw puzzle that had three-quarters of the pieces missing. He never would get the completed picture; it just took too many years of a man's life in study and application to finish the job. All he could do was to fit the meager pieces in where he thought they might fit, and then try to ignore the blank spaces that he could not possibly reconstruct.

At midnight, Hanson took to the telephone and called California.