Just finished re-reading "Executive Orders, by the late Tom Clancy. Came out in 1995 - Clancy passed away in 2013.
Plot revolves around an Iran theocratic dictator who attacks America with Ebola virus, resulting in a shutdown of the country.
The book picks up at the end of "Debt of Honor" (published Aug 1994)as a continuation of the storyline from that book. Japan attempts to knock the US of the top of the world order with a war that included the Japanese getting nukes, they try to destroy the US economy using software (that runs the stock exchange) and setting up trends involving currency and T-bills among other things. The US is already in major turmoil, before the ebola virus attack, as a result of what occurs at the end of "Debt of Honor".
Spoiler Alert-If you read "Executive Orders" before "Debt of Honor" you might screw up the ending of "Debt of Honor".
Both books are stand-alone, but a lot of references in "Executive Orders" are much clearer if you read "Debt of Honor" first as is the world situation. Several storylines/characters continue from the first book (other than Jack and the gang).
Amazing - reading it today - how prescient Clancy was in his description and terminology.
Almost eerie in what's going on now - under slightly different circumstances.
Still - well worth a read.