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Laura (Mary Tyler Moore) simply can't understand why Rob (Dick Van Dyke) has not yet shown up at a get-together at the Petrie home with her Aunt Mildred (Amzie Strickland) and Uncle Edward (Harold Peary). What Laura doesn't know is that, earlier in the day, Rob had incurred an accidental head injury with what he thought was a prop violin but which turned out to be the genuine article. Suffering from temporary amnesia, Rob has wandered off to faraway Red Hook, NJ, where, identifying himself as "Antonio Stradivarius," he is currently the star attraction at a wild party!. How is he going to explain this one to Laura once he recovers his wits?