I know what you're asking - is there a pompous earl in this book? Yes. Do we meet a few new varieties of giants? Yes. Is there a somewhat contrived conflict between Brianna and Tavis? Yes. Do a lot of characters die? My goodness, YES.
Before I address the book itself, can I mention how ridiculous the cover art is? A princess stands in a window far too large for the rest of the structure and gasps as King Henry VIII attacks. This is the kind of cover you wouldn't want any of your friends to see. An embarrassment.
Now, the actual book... while the by-now-familiar Twilight Giants tropes are all here, Denning tries a few different things. Some passages are narrated in the first person by the villain, Lanaxis (the titular twilight titan), which is fun and interesting. While there is less action overall, the battle sequences are huge and wonderfully written (the storm giant sequence is especially memorable). In their final appearances, I finally felt like I was starting to get to know Brianna, Tavis, Avner, and the rest.
The downside is the plot, which is downright weird. This book takes place three YEARS after the previous one, and Brianna has been pregnant the ENTIRE TIME. When she finally has her baby, its face changes from handsome to ugly and it growls constantly. Basil is suddenly "ancient" although he was never described that way before. There's also suddenly a magical weapon that everyone wants AND an alliance of giant-kin who are out to get our heroes. The amount of material here is almost enough for a trilogy in its own right, not the last entry of one.
The ending is also a slight disappointment. After spending so much time with these characters, the final chapters seem extremely rushed and provide an ambiguous (at best) wrap-up to the whole saga. Does the war with the giants end? Do Tavis and Brianna live happily ever after? We don't really find out. It's a mediocre ending to a solid, entertaining fantasy series.