What is the theme of Second Isaiah?

The second portion of Isaiah (the latter chapters) speak of the eventual redemption of the Israelites by God. Tradition states that all the chapters of Isaiah were authored by the one Prophet Isaiah. Non-traditional theories claiming more than one author of the Book of Isaiah are based upon zero physical evidence and are refuted by the fact that the Septuagint and the Dead Sea scrolls (and all other ancient sources) include the complete text of Isaiah.