While marketed as a superhero horror film, "The New Mutants" (2020) earns its place on a "Best Mystery Movies" list through its core narrative structure and lingering questions that plague both the characters and the audience. The film traps a group of young mutants within a secluded hospital, and the central mystery revolves around understanding why they are there, what experiments are being conducted on them, and the true nature of their powers. Flashbacks and fragmented memories hint at traumatic pasts, and the protagonists must unravel these secrets to understand the forces that hold them captive and the true threat they face, turning the hospital into a psychological puzzle box they must escape. Furthermore, "The New Mutants" employs classic mystery tropes such as unreliable narrators and a sense of paranoia. Each character's perspective is clouded by their powers and past traumas, making it difficult to discern the truth. The constant threat of the unknown and the gradual revealing of cryptic clues about their captors and the source of their powers keeps the audience guessing until the climactic confrontation. The film deliberately obscures the lines between reality and illusion, leaving viewers pondering the true nature of the hospital and the characters' shared experiences long after the credits roll, solidifying its credentials as a compelling mystery.