read One Second After
Reading One Second After makes it hard to sleep soundly. That scenario, devastating the US with an anonymous EMP strike from a cargo ship in the Gulf of Mexico, I feel will eventually happen. There’s no MAD retaliation to deter it. Better to deal with the Koreans, Iranians and probably Pakistanis now. MAD has worked well for six decades but will soon be obsolete.
A good work of fiction.
Do a search for scientific studies on EMPs. You will not be nearly as worried.