The ISBN of The Fear of Freedom is 0-7448-0014-5.
The ISBN of The House of Fear is 8184000979.
The ISBN of Fear on Wheels is 0671692771.
The ISBN of Without Fear is 0785128158.
The ISBN of State of Fear is 0007181590.
The ISBN of Fear the Darkness is 1844163261.
The ISBN of Freedom - novel - is 0374158460.
The ISBN of The Cauldron of Fear is 0-425-10848-1.
The ISBN of The Wise Man's Fear is 978-0756404734.
The ISBN of Mortal Fear is 0-7434-6867-8.
The ISBN of Torch of Freedom is 1-4391-3305-0.
The ISBN of Pirate Freedom is 0-7653-1878-4.
The ISBN of The Freedom Trap is 1-842-32050-5.