When young Mary Carpenter and wealthy Peter Cooper, both carrying luggage initialed with a large “C,” check into a seaside hotel they end up with each other’s bags. Mary, an astronomy fan, has several volumes by Prof. Carl Von Munsternberg mixed in her bag which Peter takes note of before also slipping in a bestseller, "The Road to Love," before returning it to the desk and retrieving his own bags. Peter, trying to avoid a widow who pursues him but still meet Mary, disguises himself as Prof. Von Munsternberg so that Mary will take notice of him. Gaining her acquaintance all is going well until the real professor shows up! Becoming convinced Peter is the thief who stole the widow’s jewels a madcap chase begins that ends with Mary and Peter united at last.
