Nahum 1:7 (NASB) The LORD is good, a stronghold in the day of trouble, And He knows those who take refuge in Him.

You might say that the book of Nahum is the sequel to the book of Jonah (he having been swallowed by a huge fish).

The prophet Jonah was sent to the city of Nineveh to tell the people they would be destroyed in 40 days. However, the people of the city repented of their wicked ways, humbled themselves and called upon God. Even though the Ninevites were not the Chosen people, since they repented, God relented.

However, sometime later (in the next century) the Ninevites returned to their evil ways. Another prophet, Nahum, gives them a word. He even points out that the Lord is a stronghold and refuge in the day of trouble. (Hint. Hint.)

This time they ignore the words of the prophet. They are full of themselves. They think they are above the justice of God, and continue in their evil with arrogance and pride.
Before that century is out, Nineveh would be abandoned. The Assyrian Empire would collapse.
I’m thinking there is a lesson to be learned here.