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.
Gretchen's grieving father who sold their old home and is involved in the resort project.
Gretchen's stepmother who is unaware of the resort's true purpose.
Gretchen's protective bond with her half-sister drives the climax as she fights to save her.
König employs Gretchen while secretly using the resort for species preservation experiments.
Henry acts as an investigator who initially allies with Gretchen before his true intentions are revealed.
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