"Should the Ravens ever leave the Tower of London, the White Tower will crumble and a great disaster will befall England..." - John Dee, July 1607
The Ravens of Dee is a secret society in ZombiU, lead by Sondra. They are followers of John Dee, an astronomer who created The Black Prophecy; which predicts that 2012 will mark the beginning of an apocalypse. The Ravens of Dee study John Dee's work in an attempt to prevent the apocalypse. In this respect, they oppose the Prepper, who believes that there is no possible cure or rescue, and that only the prepared will survive.
Despite all the Ravens believing in the the cure, only Dr.Knight shows any effort to design a cure.
In nearly all the maps there is a raven's safehouse where the player can rest and upgrade their weapons. In order to find them the survivor must scan the logo on the left to find the code to open the door. There is some though that can be easily opened, such as the one at Buckingham Palace.