The Promise is the third installment in the thrilling Comes the End series. Sequestered in a mountain base dubbed Camp Noah, the safe refuge that the Christians have established is threatened by the "Brothers," aliens who claim to have come to save the human race. To do this, however, religion has been forbidden, and those who hold fast to their beliefs are being hunted and killed. The Christians of Camp Noah seem to have found a perfect existence, yet it is threatened by spies who have infiltrated their community. These traitors are leading the Brothers to the Christians in what will surely be a terrible, final conflict.