Matter-transmitters: mankind’s dream come true. Code-named ‘posters’, the devices are the invention of Justin Williams and Cinnamon Wright. Against paranoid security restrictions the poster is to be tested at last – Williams and Wright expect a triumphant place in history as bringers of freedom to civilisation. But something goes terribly wrong on the first long-distance trial run. The courier arrives back mysteriously different – and then kills himself. To prove his faith in his invention, Justin has himself posted thousands of miles. He is unchanged – but the¬†world¬†is somehow different…