In the depths of an Icelandic bank vault, security consultant Sigrid Einarsson discovers a hidden chamber containing a perfectly preserved man from the 1920s. Upon opening the sealed room, the stranger awakens, identifying himself as the "Custodian of the Seventh Seal." He reveals that Sigrid's bloodline was chosen to protect a dangerous otherworldly artifact—the vessel—that must never be opened. As dimensional anomalies threaten reality, Sigrid works with the Custodian, Detective Ingvar, and Halldór, a janitor who speaks only in mathematical rhymes, to contain the threat. When a fracture between dimensions forms, Sigrid learns the vessel is a multidimensional anchor point that prevents catastrophic reality breaches. Faced with an entity offering forbidden knowledge, Sigrid chooses to protect humanity rather than gain cosmic understanding. By stepping into the dimensional fracture, she completes the sealing but undergoes a profound transformation.