Confess or Crash

The whole family was on a road trip when the brakes suddenly failed on the highway, locking the car at 150 km/h. The doors wouldn't open, and the signal was blocked. A strange male voice on the car's infotainment system announced the start of a game: tell the truth, and the speed will decrease by 10 km/h; lie, and the speed will increase by 10 km/h. Infidelity, espionage, secret affairs, a murder case from ten years ago—the secrets of everyone in the car are gradually revealed. Who is really controlling this car?