
Mike is hired to find the culprit behind a series of pranks at an exclusive girls' prep school - students have been poisoned, burned with acid and now shot at. Mike has three suspects: an elderly caretaker who was forced to retire, a middle-aged administrator who was passed over when the new head mistress was hired by the school's Board of Trustees, and lovely student who craves attention.
When an elderly man living in Mike's hotel unexpectedly inherits $7500, Hammer appoints himself the man's guardian to ward off moochers and con artists.