Summary of the Book of 2 Kings
This is the second part of the book of Kings. Originally this book and the preceding book were combined into one longer book in the Hebrew Bible. The same thing happened with the books of Samuel and Chronicles (immediately before and after the books of Kings).
Second Kings covers about 270 years of history. This includes the reign of Ahaziah (son of King Ahab) to the Babylonian captivity and a bit beyond. The book covers about 26 years into the captivity (2 Kings 25:27).
It is not certain who author of the book was, but tradition says that Jeremiah the prophet wrote the book.
This book ends with the Babylonian captivity (plus a few years). Its contents end around 586 BC. The book was probably written some time between 586 and 540 BC if Jeremiah was the author. Jeremiah also wrote the book bearing his name about the same time.
Purpose of 2 Kings
Like the other books of history, this book seems to be more historical in nature as opposed to trying to drive home a certain lesson. It traces the history of Israel from the divided kingdom after the death of Ahab until the Assyrian captivity of Israel and the Babylonian captivity of Judah.
In the first and second books of Kings, the reader can see the progression of Israel from its glory to its downfall. The history of the wickedness of the kings and the nation show the decline and captivity of the great and mighty nation of Israel. When Israel began to abandon the God of heaven and chose to worship other gods and ideologies the nation declined in spirituality. Their sin resulted in punishment by slavery like they escaped in Egypt.