Jack and his squad search for a driven neurosurgeon, Dr. Lianna Sardo (Lisa Edelstein), who disappeared after a nighttime jog in the city with her ex-husband, Dr. Evan Mayhew (Eric Lutes - Caroline in the City). For a month prior to her disappearance, Lianna seemed to be under an unusual amount of stress, according to Evan. In addition to Evan, the suspects include Lianna's violent ex-boyfriend and a doctor whom she was going to testify against in a malpractice lawsuit. The case becomes clearer when information reveals that Lianna tried to contact the child she had given up as an unwed teenager--and that an imposter may be posing as her daughter.
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