<p>　　U.S Postal Inspectors are called in when a &nbsp;suburban couple are killed by a mail bomb. Suspicion immediately falls on the couple&#39;s &nbsp;estranged and heavily in debt son, who &nbsp;also just happens to be a Navy munitions &nbsp;expert. But investigations reveal that he is &nbsp;on the run from a past event in his life that is associated with the bombings.</p>