"Book 5"--Goodreads.

"A blizzard is coming to Hazelwood Elementary! It's snowing, and there's excitement in the air because the school day might end early. Students and teachers alike are looking forward to seeing what happens! Meanwhile, Abdi is distracted and worried because his brother is having surgery. He's supposed to go home with Henry, but they miss the bus and end up having an unexpected adventure with Mr. Wolf!"--Provided by publisher.