As World War I winds to a close, two men--Dr. William Rivers, a psychologist whose dedicated healing sends men back to the brutal front, and Billy Prior, a shell-shocked soldier determined to rejoin the final English offensive--are profounded affected by the events of the era.

It is the spring of 1918, and Britain is faced with the possibility of defeat by Germany. A beleaguered government and a vengeful public target two groups as scapegoats: pacifists and homosexuals. Many are jailed, others lead dangerous double lives, the "the eye in the door" becomes a symbol of the paranoia that threatens to destroy the very fabric of British society.