A Sweet Mystery

[Zack]

Zack posted a new thread:

A Sweet Mystery

[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,...

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