Some series have trouble progressing their story after growing to epic-scale conflicts. Think of the problem with Marvel movies at the moment. The MCU's first decade started with small stories of exceptional individuals becoming superheroes, then those superheroes joining up to fight as part of a bigger team, and eventually, it grew to a threat in Infinity War that literally spanned the known universe. It was on a course of constantly one-upping itself, always trying to tell a story that was bigger than the one before. This sort of growth is unsustainable, and you either understand that and let your stories shrink in scope again so that you can relieve the pressure and let your series build up momentum naturally once more, or you can keep pushing past the danger point (like expanding beyond a universe into the nonsense that is Multiverse storytelling) and see your series implode.
I bring this up because this book has recognised this issue and taken the wiser course of action. On its surface, that might seem like a crazy suggestion. After all, this is a story about two supremely powerful beings saving a world and doing incredible things. But when you really look at it, that is all just situational circumstance, and not really what this story is about.
This story is about two people who have overcome a massive obstacle in their lives and are now escaping to a new life to start over. The impossible pressure of avoiding armageddon has been removed from their shoulders, and they can start over with a new story about establishing a new normal. Adjusting expectations to the level of a newly married couple with near god-like power, you soon realise that this was actually an almost intimate story about Ellie and John that I found myself really enjoying.
In fact, I enjoyed it so much that I couldn't put it down, and found no issues significant enough to warrant the removal of a star, so it's a full 5-stars for this outing.