A family’s desire for a fresh start unravels when their lodger’s true identity is revealed, sparking a perilous journey to uncover dark family secrets and the cost of maternal love.

Two detectives begin an investigation into a disastrous secret military experiment where five prisoners were kept awake for thirty days in a sealed gas chamber.

Examine the investigation into school assistant Maxine Carr and her fiancé Ian Huntley, who was imprisoned for the killings of school girls Holly Wells and Jessica Chapman.