Secret society

Secret Society is the most secluded house. In order to join the secret society, your Young Adult sim must become friends with three or more sims who are in the secret society, usually distinguishable by their uniforms, a suit with a llama jacket. Once this is done your sim will be taken (by force) to the secret society lot, once there they can leave and return any time. This unlocks the "secret handshake" and the ability to hack their grades via computer.