Ava Mitchell, a young investigative journalist, wakes up in total darkness, gasping for air. She soon realizes she has been buried alive inside a wooden coffin with only a lighter and a nearly ᴅᴇᴀᴅ phone. Panic sets in as she struggles to remember how she got there. A chilling voice message on her phone warns her that she has limited time before her oxygen runs out, turning her captivity into a race against death.
Flashes of memory reveal that Ava had been working on a high-profile corruption case, exposing a powerful underground syndicate. Her last known contact was a whistleblower who had promised her evidence but betrayed her instead. As she pieces together the puzzle, she starts receiving mysterious texts from an unknown number, taunting her with cryptic clues about why she was buried alive.