In early 2014 scientists thought they had found evidence of gravitational waves from the Big Bang. These waves could help physicists on the search for a Theory of Everything grand explanation of all physics. However, doubts set in almost immediately with rival groups reanalysing the data. Horizon embarks on a journey through this wild frontier of physics story of rejection, perseverance and professional courage where, for some, glory beckons while, for others, their life’s work hangs in the balance.