We just finished our "God Saves" series on the book of Isaiah last Sunday. It took us 53 weeks worth of Sundays to study our way through it. Isaiah is obviously a big book and it's easy to lose the forest for the trees.
The Bible Project videos are great for gaining a clear "forest view" of a book of the Bible. Here are their two Isaiah videos. They're a great introduction, but also a great recap on the heels of our study.