Book of Hosea 1-14
Hosea gives us a rather long winded parable on the Israel's fall from grace. We've heard it all before in the same style (including Israel portrayed as a whorish woman). At least it's a pretty easy read.
God tells Hosea to marry tainted women and then buy a woman and have an affair with her.
The old "God told me to!" excuse. Timeless.
There is really nothing of note in this book other then God's disappointment with his chosen people and the brutal way he deals with it.
Ultimately, god will forgive them and take them back.