John Brunner 
Infinitive of Go [EPUB ebook] 

CODE NAME POSTERThe first practical matter transmitter was a success, or so everyone thought. In spite of paranoid security restrictions, Justin Williams and Cinnamon Wright, co-inventors of the device, counted on it to revolutionise civilisation and gain them an honoured 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 came through unchanged. It was the world that was somehow different…