[Note: This is a guessing game with minor role playing. It will start out easy and get harder, progressing whenever someone answers correctly. Everyone is free to join in. ] Hey Gumshoes! Zack here and I need your help! ACME Crime net just got a mysterious riddle. See if you can solve it: An accidental invention from a woman with a GRAVE name and who worked a Toll House. These sweet threats owe their popularity to a special ingredient that did not melt when it should. What is this treat, and what was the ingredient that did not melt?