I'm looking for a book I read as a kid in high school. All I remember of it is:
2 characters (possibly male and female) travel to a "killer" planet where no metal can be present so take only plastic equipment including knifes and plastic bow and arrows. The planet had previously been landed on and either the planet itself, or a life-form that I remember being described as some sort of tower, can detect the presence of and control metal.
All members of the previous expedition had been killed as the planet/life-form assumed control of their equipment and used it against them.
The novel ends with one of the characters climbing the tower to kill whatever it is that controls metal.
Apologies for the lack of details, that's all I remember of the book but I'd love to read it again as I have good memories of it!