Off Armageddon Reef

Here is the saga of humanity reduced, by an implacable alien enemy, to inhabiting a single colony on the distant world of Safehold. To avoid drawing the attention of the enemy through the busy signals of an industrial civilization, the human rulers of Safehold have taken an extraordinary measure. With mind control and hidden high technology, they have built a religion in which every Safeholdian believes, one designed to keep Safehold society medieval and unnoticed forever.