Sword of Jihad by Mitchell Medford

A US H-bomb lost for decades, now in the hands of Islamic terrorists determined to bring the End of Days and usher in the mystical Twelfth Imam, and only one man--ex-CIA Operative John Pilgrim--has the slim chance to prevent the apocalypse. As Americans are being slaughtered worldwide, John races through the Middle East to find the one old friend who knows the secret location of the suicidal Imam and the charismatic Mahdi that lead the terrorists. With time running out and death chasing him at every turn, John must find a way to save his President, save his country from a nuclear holocaust, and save his own soul in a classic battle between good and evil.