This is a thorough and necessary defence of the view that God is indeed sovereign of all things - especially himself. However, at one point, he takes his view of impassibility (the view that God cannot suffer) so far that he ends up denying propitiation. (That is, he ends up denying that Christ's death on the cross turns away God's wrath from the sinner.)
So, I disagreed with him there. However, it's still very worth reading, partially because his scholarly method is absolutely excellent - his example of taking apart opposing arguments with charity, humility, careful listening, and often unanswerable thoroughness is fanastatic. And this is still the best defence of impassibility that I've read.