Dead Silence

After Mike skips out on meeting his friend Sal, he is stunned to find out that Sal has been stabbed to death near his high school. Even though there were lots of kids nearby, nobody will come forward to say what they really saw. So Mike starts asking some questions of his own and finds out that Sal was hanging around a girl who recently left a gang. Are they responsible for killing Sal? How can Mike find out the truth when nobody will talk?