The one-liner quotes advertising this book describe it as a "series of adventures," but it's more like Sal and Gabi just sort of muddle their way through middle school, which is all any self-respecting 7th grader can expect to do, right? And get their homework done. 7th grade is just awful.
But things get complicated super fast when you can rip holes in the universe and dump raw chickens on the school bully's head, but then not know how to repair the rip. The rest of the book is incident after incident in which Sal learns a little bit more about the rules for ripping holes and sucking up the calamitrons his rips leave behind.
Enter Gabi, who writes for the school newspaper and can also see the rips and even create her own, later on in the book.
At first she's out to expose Sal, then we're introduced to her baby brother, who's dying in the hospital, but it takes a loooong time for this particular plot thread to develop (the book is a whopping 382 pages) and Sal and Gabi figure out how to use their universe-ripping powers to save the infant.
It's a fun read, and the author does a great job representing Cuban culture and ways of speaking.