College-bound Gidget (Cindy Carol) is vacationing in Rome for the summer with faithful boyfriend Jeff, aka Moondoggie (James Darren) and their friends. Chaperoning the pair is Aunt Albertina (Jessie Royce Landis). However, Gidget's father Russell, worried about his daughter being abroad, asks an old friend of his, named Paolo Cellini, to keep an eye on Gidget to see that she stays out of trouble. Complications set in when Gidget begins to fall for the much older Paolo.