Despite Jonah's preaching to Nineveh about 100 years before, they seem to have turned back to their old ways. Now Nahum warns them of their final judgement...
Micah prophesied unde three kings Jotham who was wishy washy, Ahaz who sacrificed his own son and Hezekiah who when the book of the law was found repented! Read verse 6:8 for what to do!