b'Three years after Chase Massner vanished, his grieving mother calls on Nancy Grace to help find answers. Cobb County, Georgia, police are turning the case over to a cold case unit, but Grace tracks down key witnesses to retrace the Iraq War vet\\u2019s last known steps. She shares what she is finding over the next weeks in a special \\u201cCrime Stories\\u201d series. Nancy visits with Chase\\u2019s mom in this episode.'