The Fourth War by Chris Stewart Book

Written in 2005. This was an old public library book so it looks like it got wet on the page edges at one point but is still in good condition.
Along the Afghanistan border, a CIA agent meets secretly with a distraught Arab girl. She passes him a coded message before killing herself. But before the message can be deciphered, the world spins toward war: Within hours, the president of Pakistan is assassinated, and the country’s nuclear warheads go missing. Al Qaeda streams into northern Pakistan. Israel puts her combat forces on hair-trigger alert.
CIA paramilitary agent Peter Zembeic is given the impossible task of finding and destroying the missing warheads. Working with his best friend, a B-2 pilot, they develop a desperate plan to save the world from the threat of nuclear terror.