hard cover books by Tom Clancy - #5 each ISBN Commander authority - 978-0-399-16047-0 Debt of Honor - 0-399-13960-5 The sum of all fears - 0-399-13631-2 Dead or alive - 978-0-399-13723-3 Threat Vector - 978-0-399-16045-5 Locked on - 978-0-399-15731-8 Against all enemies - 978-0-399-15739-1