A boy wants to buy a present for his mum — a new mobile phone case she likes. He and his friends go upstairs using an escalator to reach the phone shop. On the escalator, a man bumps into one of the girls. They find the phone case but then notice the same man stealing phones from the shop! They try to stop him, but he runs away into the crowd. They describe the thief to others: he has dark, curly hair, a moustache, wears a black T-shirt, blue jeans, and carries a blue sports bag.
The friends act quickly to help stop the thief.