II Kings looks at the kingdoms of Judah and Israel.
The twelfth book in the Bible is the Second book of Kings. It continues on from the First Book of Kings and tells us more of the history of Israel and Judah. Both kingdoms are on a downward spiral of sin which ends with God's judgement and the handing over of both nations into foreign captivity.
"And Isaiah said, This sign shalt thou have of the Lord, that the Lord will do the thing that he hath spoken: shall the shadow go forward ten degrees, or go back ten degrees? And Hezekiah answered, It is a light thing for the shadow to go down ten degrees: nay, but let the shadow return backward ten degrees. And Isaiah the prophet cried unto the Lord: and he brought the shadow ten degrees backward, by which it had gone down in the dial of Ahaz"
God was true to his word and Hezekiah lived for 15 more years after he had prayed to God