Michael Dahl 
Haunted Backpack [PDF ebook] 

After school, a young boy is walking home when he hears whispers behind him. He turns, but no one is there. It happens again and again. There’s something alive inside his backpack! Is it a ghost? A monster? With short chapters, easy-to-read text and enhanced back matter, Boo! Books deliver just-right frights (without the sleepless nights) for the earliest readers.