Big Smoke (The Apocalypse Virus Trilogy Book 1) by R.F. Blackstone
A disgraced spy
An assassination plot
The beginning of the end
It was suppose to be easy. Go to Cuba and foil the assassination of the President of the United States of America and the start of World War III. But when the Apocalypse begins, Christine Moore must decide which is more important to fight for; her past or the oncoming storm.