I don't know much about the Inhumans in general and Black Bolt in particular, but I picked this one up because of all the buzz around it.

I can tell it was good and I'm sure it would be better if you were more familiar with these characters? It was a bit confusing and perhaps a bit grittier than I personally prefer my comics to be. Still--it was a pretty moving story arc despite me not being the ideal reader for this title.