Why did everybody step off the ship in this strange valley and promptly drop dead? How could a well-equipped corps of tough spacemen become a field of rotting skeletons in this quiet world of peace and contentment? It was a mystery Peter and Sherri had to solve. If they could live long enough!Peter Wayne took the letter out of the machine, broke the seal, and examined it curiously. It was an official communication from the Interstellar Exploration Service. It read:FROM: Lieutenant General Martin Scarborough, I.E.S.TO: Captain Peter Wayne, Preliminary Survey CorpsReport immediately to this office for assignment to I.E.S. Lord Nelson. Full briefing will be held at 2200 hours, 14 April 2103.By order of the Fleet Commandant.It was short, brief, and to the point. And it gave no information whatsoever. Peter Wayne shrugged resignedly, put the letter down on his bed, walked over to the phone, and dialed a number.