Mary keeps an eye on a teen witness whose separated parents are too distracted by their own issues to pay attention to their daughter. Marshall thinks a witness may have betrayed his brother; and Brandi tends to Scott after he's attacked.
A witness with Asperger's Syndrome doesn't want to testify against her only friend, frustrating Mary. Elsewhere, Marshall and Stan try to prevent the deportation of a key witness; and Brandi tells Mary about a career plan.
Mary's witness Dominic, a former hit man with a fondness for explosives, falls in love for the first time. But when things go awry, Mary races to stop him from returning to his old profession to seek revenge against his girlfriend.
An FBI informant isn't told that his cooperation is going to necessitate him going into WITSEC until Mary and Marshall show up to get him. But when he balks at joining the program, he gets into serious trouble. Stan works with one of Marshall's witnesses while he was away who is "punch drunk" - suffering from pugilistic dementia.moreless
While Marshall is determined to find Mary's attacker, Jinx is unhappy that she's going back to work. There's concern that one of Mary's witnesses has returned to his old occupation in spite of successfully integrating into the WITSEC program.
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