The Judas Valley

He had lost all sense of right or wrong. Justice and injustice were the same, and his only thought was, kill—kill—kill!
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 Corps
Report 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.
A moment later, a girl's face appeared—blonde-haired, with high cheekbones, deep blue-green eyes, and an expression of the lips that intriguingly combined desirability and crisp military bearing.
Lieutenant James speaking, she said formally. Then, as Wayne's image appeared on her screen, she grinned. Hi, Pete. What's up?
Listen, Sherri, Wayne said quickly. I'm going to have to cancel that date we had for tomorrow night. I just got my orders.
The girl laughed. I was just going to call you , I got a fac-sheet too. Looks as though we won't see each other for a while, Pete.
What ship are you getting?