The invitation arrived in a plain white envelope, with no return address. It simply read: "You have been chosen to participate in a unique psychological experiment. Meet at the address provided on Saturday at midnight. Come alone."
Sarah stared at the invitation, her heart pounding in her chest. She had always been intrigued by the workings of the human mind, but this invitation seemed too mysterious, too ominous. And yet, she couldn't resist the pull of the unknown.
As the clock struck midnight on Saturday, Sarah found herself standing outside an old abandoned warehouse on the outskirts of town. The air was thick with tension, and she could feel the hairs on the back of her neck standing on end.
Taking a deep breath, Sarah pushed open the creaky door and stepped inside. The room was dimly lit, with shadows dancing on the walls. A figure stood in the corner, their face obscured by darkness.
"Welcome, Sarah," a voice said, sending shivers down her spine. "I'm glad you could make it."