Hezekiah mourning sendeth to Isaiah to pray for them. Isaiah comforteth them. Sennacherib, going to encounter Tirhakah, sendeth a blasphemous letter to Hezekiah. Hezekiah's prayer. Isaiah's prophecy of the pride and destruction of Sennacherib, and the good of Zion. An angel slayeth the Assyrians. Sennacherib is slain at Nineveh by his own sons.