Catholic-school senior and aspiring police officer inspired by her slain father. She independently investigates a serial killer targeting teenage girls, enlists police cadet Tony Campbell, and eventually discovers his true identity as the murderer, Daniel Henry Moffat. She outwits him, lets him fall to his death, and joins the police force after graduation.
Tony becomes Mary's primary partner in tracking the serial killer.
Guinn acts as a protective mentor figure due to his past partnership with Mary's father.
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