John Dougherty 
Jack Slater and the Whisper of Doom [EPUB ebook] 

Jack Slater is an official Monster Investigator — licensed to hunt out monsters who turn up under beds and terrorize small children. Brave Jack has never met a monster that could scare him… until now. The Dark Depths — home to the most terrifying of all monsters — have been opened, and Jack and his feisty friend Cherry must enter them and face the danger within. Armed only with their wits, a torch and a teddy bear…