How much do you know?
Well, that his family was framed and there's some secret hidden in the metal cover that only a snake can see.
Not just any snake; A heat-sensing pit viper. All it takes is a little warmth.
I just... I don't understand. Why would your great-grandfather hide a secret for a snake?
He... didn't.
I... [gasps in realization] It wasn't his journal; that's the secret. [envisions herself in a flashback of Zootopia in the 1900s] Zootopia wasn't created by a mammal; it was created... by a snake.
Gary's great grandmother (Agnes De'Snake). She wanted to make the city a place where all animals felt welcome, so she invented her weather walls to help everyone. She just needed an investor, a partner. But when my great-grandfather saw what her idea could be worth, he plotted to steal her plans for himself. So he committed a murder- his own maid- and framed Gary's great-grandmother. And because she was a snake, everyone believed his lie. Soon, no reptiles were welcome. And over time, my great-grandfather buried the reptile neighborhood in snow. And he died, believing no one could ever uncover his crimes. But... he was... wrong.
Her original patent was saved. That's what you're looking for. She hid it in her home. Find her home, find her patent.
[End of flashback]

