The creepy twins tell Shaw about the situation with the Krakoan drugs in Costa Perdita. He goes to the country to solve the issue by himself, by selling the drugs to a rival cartel instead of the one who attacked our protagonists in the last arc. Maybe this plotline will get picked up again later, maybe not, I don't really care either way tbh!
Amara, Armor and Boom Boom travel into the Amazon forest to visit Nova Roma, as we have seen in the preview. Brisson has a really weird idea of what the Amazon rainforest is, because I really have no idea why some brazilian mutants would be running around there to escape or why would anyone put a Krakoan gate in the middle of it since there's lot of more acessible places in Brazil. But alright!
Anyway, the white supremacists, I mean, the residents of Nova Roma called Amara because have found a runaway mutant "intrusor" in their lands. The brazilian mutant tells Amara and the others that he was running away from these predator X-looking monsters we saw in Marauders - the monsters also ate all his friends.
Magma, Armor and Boom Boom go into the forest to look for the monsters, and after a while they find three of them and manage to defeat them. Pretty straightforward. The only relevant thing that happens is that Boom Boom gets outed as an xenophobe. Oh, and also there's an evil blond lady who seems to be the creator of the monsters who appears in the last page, plotting her revenge. Eh.
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So far Brisson's issues haven't really explained why this book needs to exist past Hickman's arc, honestly. But I guess the main cast is returning in the next arc, so maybe it'll get better. But as of now, I'd be fine if this was cancelled to make way for a more interesting book to exist/and the New Mutants keep appearing in other titles.