Only a week into his job as hall monitor and class protector, Sam Graves and his friends Lucy and Antonio are trying to uncover the secrets of Eerie Elementary, their living and malevolent school--and then Lucy gets eaten by her locker.

A snowstorm traps the students inside Eerie Elementary, and soon the school begins to freeze from the inside out. Sam uncovers that this big freeze is a living, breathing monster brought to life by mad scientist, Orson Eerie--and Sam, Lucy and Antonio must find a way to get the heat back on before all the students freeze to death, while facing the truth that Orson Eerie is even more powerful and dangerous than they realized.

At the end of recess at Escuela de Espanto, everything on the school grounds suddenly comes alive and turns into a fog-filled jungle maze intent on trapping and disposing of hall monitor Sam Cementerio and his friends Antonio and Lucía.