Nine people from all walks of life find themselves chained to bars in a small concrete room. An armed, masked man enters the room and informs them that they all have something in common. He explains that they must figure out what it is. As motivation, he warns that every ten minutes he will be entering the room. If they are unable to tell him how they are connected he will shoot and kill one of them each time. As he exits, the nine start to panic as they try to see how or when their lives have intertwined.