He gives a helpful working definition of sin and makes valuable distinctions between different categories of sin; he talks about the relationship (and the difference) between sin and folly and handles the tricky ‘sin for me’ (but not necessarily for you) aspect of sin. You’d think a book all about sin would be heavy and depressing, but Plantinga is positive; honest, not naive, but gracious.
Something I really benefited from while reading Not the Way was how reading about sin helped me refocus on my sin. And Plantinga mentions in his introduction that this is one of his objectives: to reintroduce the subject once again for serious contemplation. He’s right. We look the other way or gloss over it; we joke about it and shrug it off. It doesn’t grieve or anger us. Dessert is sinful; I just make mistakes.
As you can tell, I recommend this book. Pick it up.