A totally disappointing finish to an otherwise strong series.
I tried for 2 stars. I wanted to give it 2 stars. I started at a solid 3, then slid, and by the midpoint of this book we had reached an unrecoverable slide into mediocrity.
This final volume (to my reader's eyes) seemed like a struggle for the author: on a quest to complete a second trilogy but without a) the depth of story to really make that happen, and b) judging by the quality of writing (vs. others in the series) I feel like he just gave up halfway through and "phoned it in" for the final 100+ pages.
The back half reads like a bad sci fi trop of "world hopping", letting the author write 2 pages describing a "new world" before our heroes are whisked away again to repeat the exercise - all without having to do any further story development for page after page after page. It simply became a boring and hackneyed cycle of MacGuffin after MacGuffin.
And after enduring all of those boring pages, the actual ending was both anticlimatic, and badly written.
The first Omnibus trilogy was very strong, and I can appreciate a desire (or publisher pressure) to milk that cow a little longer with a second trilogy. Unfortunately, those books don't hold up, and Inferno brings an unsatifying end to a disappointing series.