Who wrote the novel tomorrow during cold war?

It seems you're thinking of a novel set during the Cold War, but the title "Tomorrow" is not a well-known novel from that era.

To help me find the novel you're looking for, can you provide more details?

For instance:

* Are you sure about the title "Tomorrow"? Could it be something similar, like "The Day After" or "On the Beach"?

* Do you remember any other details about the novel? The plot, characters, genre, or even the author's name could help narrow it down.

Once you give me some more information, I'll be able to assist you in finding the novel you're looking for.