The Book of Skulls
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The Book of Skulls is a fantasy novel by Robert Silverberg, which was first published in 1972.
The story concerns four students who discover a manuscript, The Book of Skulls, which reveals the existence of a sect, now living in the Arizona desert, whose members can offer immortality to those who complete its initiation rite. To their surprise, they discover that the sect survives, and is willing to accept them as acolytes. But for each group of four who enter the rite, two must die in order for the others to succeed.
It has been republished in SF Masterworks.