Since 2015, there has been a spectacular boom in a centuries-old delusion: that the earth is flat. More and more people believe that we all live on a pancake-shaped planet, capped by a solid dome and ringed by an impossible wall of ice. In Off the Edge, journalist Kelly Weill draws a direct line from today's conspiratorial moment, brimming not just with Flat Earthers but also anti-vaxxers and QAnon followers, back to the early days of Flat Earth theory in the 1830s. In this incisive and powerful story about belief, Kelly Weill explores how we arrived at this moment of polarized realities and explains what needs to happen so that we might all return to the same spinning globe.