New Science Fiction
Spears of God by Howard V. Hendrix
Set in the near future, Hendrix tells of a global search for meteorites said to cause those exposed to them to develop extraordinary powers. Unfortunately, it results in the near extinction of a small tribe of apparently primitive residents of the Amazon. The four survivors, three girls and a boy, fall under the protection of a pair of scientists until they all become targets of a conspiracy to control both the meteorites and the children.