The ending of Cuckoo resolves the primary threats of the film, but leaves enough lingering threads that could be brought back for a follow-up. Although the Woman With Red Eyes has been killed, it's possible that others like her may continue to exist or evovle.

Breaking down the bizarre ending of 'Cuckoo' and how its writer-director intended for it to be interpreted.

Spoiler-filled explainer breaks down the curious secrets of Tilman Singer's new horror-thriller, "Cuckoo."

Cuckoo's finale showcases the power of sisterhood and overcoming patriarchal control in a thrilling climax as Gretchen, Alma, and Ed escape the resort to start a new life in Paris.

In an interview with Hollywood Reporter, he explained that Cuckoo could be read as an allegory for reproductive health or sisterhood, but he didn’t set out to make any concrete points. And yeah, that definitely seems that way while watching!