Henry Graves has dedicated his life to the prison service, but he is unprepared for his new assignment. Tasked with managing a hidden government facility, Henry finds himself tested as never before. Tom Clarke, a precocious but naive journalist, has his own problems meanwhile. His life is turned upside down by the arrival of Julia Priestley, who seeks his help in finding her estranged husband, Arthur, an innocent dentist who has been arrested under severe new anti-terrorism legislation. Discovering a trail that implicates those at the very top of government, Tom and Julia begin a quest to find Arthur, and the truth about his incarceration. But some people will stop at nothing to keep the facility's secret hidden.