The final moments of a largely forgotten Cold War incident. You are the commanding officer of a nuclear-armed submarine, isolated deep beneath hostile waters. Above, radio silence. Below, unrest grows. Power failures cut you off from command. Cryptic messages arrive with no way to verify who sent them. As systems degrade and anxiety mounts, every decision carries the weight of a potential global catastrophe — or the chance to prevent one. Till Midnight asks whether you will follow protocol or trust your instincts when the clock is running out.