Secrets of the basement [English version]

It's 2024, and you, as a resident of Strasbourg, are living a quiet life! But at one moment everything changed. You have received an Email from a friend who disappeared 4 years ago. Letter said that your friend is alive, And you need to find the lever, and an address of your friend’s location. Since it's your weekend, you go searching. You have difficulty finding this place in a small town, and according to the letter, you need to enter a tall, white house. Well, then, you know everything.