Scimitar SL-2 seems to divide opinion. It's an Arnold Morgan book, so straight away, it should get your attention. Is it his best? No. Is it is worst? Certainly not. But, that said, it is actually, vying with HMS Unseen as my favourite.
The story line is absurd. Use a nuke to trigger a volcano to cause a tsunami to bring destruction to the US East Coast. It's that absurd it actually suspends its own disbelief. However, when Clancy wrote about a passenger aircraft slamming into Capitol Hill at the hands of a kamikaze pilot in Debt of Honour, we didn't think it was prophetic, so maybe the modern era gives the absurd storyline's author a helping hand.
As with all books of this genre, you know how it will end, but that doesn't stop it being a good thrilling ride getting there.