In this first volume of a thrilling middle grade graphic novel series, a sixth-grader named Pablo discovers his locker is a portal to the realm of monsters!

For hundreds of years, something in the basement of Glenfield Middle School has waited for its chance to open a portal into the realm of monsters. Now its time has come, and the school is going to need a hero. Pablo Ortiz . . . isn't that guy. All he wants to do is lie low and get through middle school in one piece. So when Pablo accidentally opens the portal and summons a vengeful Aztec goddess, he'll need the butt-kicking skills of his new friends and the wisdom passed down by his abuela to take her on.