Sophie Dunston is one of the nations best known sleep therapists. Her specialty? Night terrors, the fears that ravage her ten-year-old son Michael. Perhaps rightly so because Michael has witnessed a horror that most of us cannot even imagine. He saw his grandfather kill his grandmother with a single shot in the head and then try to kill him. This behavior, so unlike Sophie's father was due to REM-4, a chemical originally invented by Sophie who had no knowledge that it would turn normal people into zombie-like killers.
Now, after all the tragedy she has endured one of these killers is after her. She will do anything to protect Michael, even accepting the help of Matt Royd, a recovered REM-4 victim. It will come as no surprise to Johansen readers that at first Sophie detests Matt but soon has a change of heart.