A world-renowned string quartet faces a crisis when the cellist, Peter, announces he has been diagnosed with Parkinson’s disease and will soon retire. This revelation shakes the group to its core, threatening their 25-year bond. Second violinist Robert argues for a change in the group’s hierarchy, seeking to alternate first chair with Daniel, the inflexible first violinist. This suggestion ignites tensions, exposing suppressed resentments and rivalries among the musicians.

As the quartet prepares for an important performance, their personal lives unravel further. Robert’s marriage to violist Juliette is strained by his affair, causing deep emotional turmoil. Juliette struggles to maintain unity within the quartet and her family. Meanwhile, Daniel becomes involved with Alexandra, Juliette and Robert’s daughter, complicating matters further. The group must navigate these personal and professional challenges as they confront the prospect of an uncertain future without Peter, all while striving to maintain their musical legacy.