Grabbed By The Ghoulies's storyline progresses in chapters. There are five chapters with a different objective for them each.
Chapter 2: The Restoration: When Cooper finally finds Amber, the mad Dr. Krackpot intervenes and transforms Amber into a hideous Ghouly. The whole chapter involves finding three ingredients around Ghoulhaven Hall and returning them to Ma Soupswill who will create a cure for Amber. Chapter 2 consists of levels 13-52.
Chapter 3: The Riddle: After curing Amber, Cooper is called by Crivens to find three riddle pieces to open the door to the Baron's Quarters and the whole Chapter involves finding the pieces. Chapter 3 consists of levels 53-86.
Chapter 5: The Race: After defeating the Baron, Cooper is reunited with Amber and Mr. Ribs gets the Baron's key. The chapter involves entering previous rooms through a secret passage way and freeing imprisoned children. Chapter 5 consists of levels 88-100.