CERN's Large Hadron Collider sits at the center of this account of the decades-long search for the Higgs boson, the particle theorized in the 1960s to explain why matter has mass at all. Physicists and engineers walk through the scale of the machine, a 27-kilometer ring built to smash protons together at energies meant to recreate conditions moments after the Big Bang, and explain why finding one particle required building the largest experiment in scientific history. Interviews with researchers on the ATLAS and CMS teams track the mounting pressure as data accumulates and rival groups race toward the same announcement, while archive footage covers the collider's construction and its early setbacks, including the breakdown that delayed the project by a year. The film builds toward the 2012 announcement at CERN, capturing the moment physicists who had spent careers on the hunt finally see their evidence confirmed. It is as much a study of how modern physics collaborations work, mixing competition and shared stakes, as it is about the particle itself.