Code name Poster... The first practical matter transmitter was a success, or so everyone thought. In spite of paranoid security restrictions, Justin Williams and Cinnamon Wright, co-inventers of the device, counted on it to revolutionize civilization and gain them an honored place in history. But the first long distance field test with a human being - a diplomatic courier carrying a vital message - somehow misfired when the courier killed himself on arrival at his destination. To prove his faith in his invention -- and to escape charges of sabotage -- Justin had himself "posted" thousands of miles. He same through unchanged. It was the world that was somehow different...