Disappeared - Season 4 Episode 17 Hometown Hero

Local police know Margaret Haddican McEnroe as a hero firefighter, with a fiery temper but strong maternal instincts. So when she disappears from her home, leaving behind her infant daughter alone in her crib, authorities, friends and family are all baffled. How could this loving mother vanish without a trace? It seems unlikely the feisty Army veteran was abducted by a stranger, so the investigation focuses on people she knows. Finally, the FBI is called in and the focus of suspicion narrows down to someone that McEnroe knows very well indeed.