The Judas Valley by Robert Silverberg, Randall Garrett, Gerald Vance

Fifty-nine men and one love interest land on a world that killed most of the first scout ship that landed.
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!
Originally published in Amazing Stories October 1956.
Total Running Time (TRT): 1 hour, 17 min.
Randall Garrett (1927-1987) was an American science fiction and fantasy author. He was a prolific contributor to Astounding and other science fiction magazines of the 1950s and 1960s. He instructed Robert Silverberg in the techniques of selling large quantities of action-adventure science fiction, and collaborated with him on two novels about Earth bringing civilization to an alien planet.
Robert Silverberg (born 1935) is a prolific American author, best known for writing science fiction. He is a multiple winner of both Hugo and Nebula Awards, a member of the Science Fiction and Fantasy Hall of Fame, and a Grand Master of SF.