Grief-stricken teenager who relocates to a Bavarian resort. She works at the front desk, investigates local murders with Henry, uncovers the cuckoo parasite conspiracy, fights to protect her sister Alma, kills the adult cuckoo, and successfully escapes with her family.
Their sisterly bond becomes the emotional center of the final conflict.
Gretchen and Alma are described as sisters in the same family. Gretchen risks herself to save Alma and later regains her trust.
A strained father-daughter relationship shaped by grief, secrecy, and conflicting decisions.
Gretchen moves to the Bavarian resort with her father Luis after her mother's death. She confronts him after learning that he sold their former family...
Beth is part of Gretchen's relocated family, although their direct interactions are limited.
Beth moves with Luis, Gretchen, and Alma to the resort as Gretchen's stepmother.
They temporarily cooperate to investigate the murders and supernatural threat.
Gretchen meets Henry while he investigates a murder, and she works with him to stake out a cottage connected to the hooded woman.
Gretchen directly opposes the adult cuckoo to protect herself and Alma.
The hooded woman pursues Gretchen, attempts to reach Alma, and emits a disorienting shriek. Gretchen ultimately stabs her in the throat.
His apparent hospitality develops into coercive control and experimentation.
Herr König offers Gretchen a front-desk job, later locks her in a pool house, and exposes her to a teenage cuckoo specimen.
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