A disquieting phone call mid-broadcast throws Astrid back into the shadow of her sister’s vanishing, compelling her to unravel the truth behind the long-unsolved mystery.

Astrid returns to the house of her youth, seeking answers in the echoes of the past. Meanwhile, Ida’s connection with Jakob deepens, and he becomes increasingly captivated by a peculiar book.

Jakob guided Ida, Amelia, and Falke to the island for the equinox. Having gleaned further insight into the peculiar symbol, Astrid sought out a former teacher for answers.

Astrid begins to discern patterns, aided by Ida's longtime companion, yet the childhood visions that haunted her threaten to unravel her grasp on what is real.

The return address offered further hints, yet Astrid’s persistent pursuit of answers stirred unease. Following the events on the island, Ida felt adrift, isolated in her sorrow.

As Astrid draws nearer to the truth, she faces her mother. Ida’s long-anticipated graduation is fractured by a storm of anger, accusations, and revelations.