De-Evolution

The Human colonists must hunt for two children taken captive during a devastating storm by a member of what they thought was wildlife but when they finally find the human children they are being cared for by natives who had a thriving culture as little as 100 years ago but who are now little more than cave dwellers. The humans have been here over a year and now they start to realize that their memories are being effected much like the memories of the natives. If they dont figure out what is causing this de-evolution fast they might be in the same situation as the natives.