ACT ONE: RAGE
During a fight, Tristan kills Isolde's betrothed, Morold. When Isolde has the opportunity to take revenge, she believes from a look in Tristan's eyes that he loves her. She tends to his wounds and thus saves his life. The opera begins when Tristan takes Isolde as a captive to King Marke, who wishes to marry her. Isolde is frantic with rage and cannot abide Tristan's betrayal. Aiming to kill him and then die herself, she orders her maid Brangäne to prepare a poison cup. But instead, Brangäne provides a love potion that inextricably entwines the young couple: Isolde with Tristan, and Tristan with Isolde.