It’s probably my favourite of the three novels in the series so far. It answers many of the questions raised in Dark Glass, especially about Rodin and Paskia.
But it’s not the end. Dominions will continue. The whole series is going to be structured as a collection of trilogies. Deep Water completes the first trilogy, which is focused on Rodin. He will return (probably in Dominions V), but the next trilogy will deal with larger issues around the Dome and the surrounding districts (and further afield).
I’m working on Dominions IV at the moment, but it won’t be ready until well into next year. But for now, there is the first trilogy, ending with the new book, Deep Water.