In Melbourne, eight passengers are riding a street car - two women talking, a smoker with a cigarette at the ready, a father and daughter, a guy on a cell phone, a solitary woman, and a solitary man. They're joined on board by a tall young Arab-looking man carrying a full gym bag. A few stops later, he leaves the car, and the bag stays behind. As the streetcar continues its journey, the passengers begin to get nervous. A sign on the train wall says "If you see something, say something." Can they report the isolated bag in time?