en CB01 OFFICIAL. While visiting an apartment, Adrien feels a twinge of jealousy as he watches Tess, his partner, enjoy herself with another visitor. That very evening, he receives a surprise summons to return for another visit. He must go alone, Tess being otherwise detained at work. He finds himself before a dilapidated old building which already has his name on the doorbell. As soon as Adrien crosses the threshold, the house closes in on him and he is embarked on a guided tour of the twists and turns of his own jealousy.