A winter getaway turns into a nightmare when Mario, Peach, Daisy, Luigi, and their friends rent a remote mountain cabin in Washington only to discover a mysterious videotape left behind by someone who never returned. After watching it, the phone rings. Seven days. As paranoia spreads, secrets unravel, and the snow traps them far from help, a waterlogged girl with her face hidden in darkness begins to appear on screens, in reflections, and in the dead of night. Some laugh. Some forget. Some don't believe. But the curse doesn't care.

When the Mario gang get together for a Mushroom Kingdom holiday, things don't go quite as planned...