Ghostwriter (TV series)/Nightmare Fuel


 * In the "Who Is Max Mouse?" climax, the only chance the heroes had to solve the case was making a high-stakes bet with the perp, and losing it would result in a guaranteed prison term for one of the kids.
 * In an equally scary arc, one of the kids suffered chemical poisoning from improperly discarded dry-cleaning chemicals near a playground that the characters frequently visited and her friends discover in their research that the effects of this poison are potentially lethal.
 * Gooey Gus. Oh dear God, Gooey Gus!