When her son goes missing, a distraught mother comes to the Cold Case squad about her husband's death. Agreeing to testify against a mob boss had earned their being in the Witness Protection Program. When a chance glimpse at a track meet of a lower-level mobster panicked the witness, they fled the WPP and the husband disappeared. Mom found a death report on her son's computer matching her husband. The mob boss is set for trial in Providence, RI and they fear the son is seeking revenge.