Brian and Julie, a young couple, are about to have their first child. But far from bringing them happiness, following the birth Julie descends into a psychotic form of post natal depression. Her increasingly frightening behaviour forces Brian to place her in a psychiatric hospital. Brian and Julie's faith - in their marriage, each other and God - is tested to near destruction as Julie's world disintegrates into darkness and psychological torment. After several weeks in a mental hospital, during which Julie forms an attachment to a male fellow inmate, Brian despairs of ever getting her back again. Sarah, his work colleague tries to help but her motives are not entirely unselfish and Brian has to fight against his attraction to her. When Julie finally returns to sanity, Brian is faced with another problem - she has run away from the hospital and disappeared.