This comic is written by Dan Slott.
-Before Black Bolt was the king of the Inhumans some dude named the Unspoken was king... Hmm, that's not how I remember my Marvel history, but whatever. Black Bolt took the throne from Unspoken after the Unspoken hid the Slave Engine from the Inhumans, which made the Inhumans weak or something. After being dethroned, Unspoken was banished from Attilan.
-Pym introduces his team of Avengers to the Infinite Avengers Mansion, which is... Well, it is what it's name suggests it is, an infinitely huge version of Avengers Mansion located in another dimension.
-US Agent and Quicksilver, who were asked by the international organization GRAMPA to look into reports that the Inhumans were possibly going to make an alliance with the Chinese, find the Unspoken, along with some Alpha Primitives, wandering around China. Quicksilver warns Agent and a member of GRAMPA that Unspoken is unbelievably powerful, but Agent doesn't take Quicksilver seriously until Unspoken utterly decimates China's super-hero team, The People's Defense Force. This issue ends with Agent nervously saying that they need to call in every Avenger they can find to stop the Unspoken.
Eh, this comic didn't really do anything for me. It was OK I guess, but Chinese super-teams and former Inhuman monarchs just doesn't really interest me. If you're into former Inhuman monarchs and/or Chinese super-teams, then rejoice, this is the comic for you! If not then I'd recommend skipping this one. For a score, I'll go with a 6 out of 10.