Adam, CIA cryptanalyst, leaves Boston and moves to the country with his wife, Emma. His handlers are afraid they won’t be able to keep him safe there, but Adam believes he needs a peaceful place in the woodland, to take a shot at military code and alter the course of the Cold War. As it turns out, this area is quite the opposite of a peaceful place...

In the attic Adam finds the hidden diary of Nicolas which, once opened, carries the nightmares of the past right into the present, putting the lives of both Adam and Emma in a great danger. How come the mysteries from Civil War era seem to be connected to what is happening during the Cold War? Who was Nicolas, the man who lived in that house more than a hundred years ago?