A scientist named Griffin invents a way to change his body's refractive index and thus becomes invisible. He uses the opportunity to carry out random acts of violence.A scientist named Griffin invents a way to change his body's refractive index and thus becomes invisible. He uses the opportunity to carry out random acts of violence.A scientist named Griffin invents a way to change his body's refractive index and thus becomes invisible. He uses the opportunity to carry out random acts of violence.