Katherine and Jonathan Prescott are hysterical when their cousin Lino, a famous Italian botanist, cancels his visit at the last minute. Katherine had planned for him to be the guest speaker at an important flower society fund-raising dinner. Her brother, Jonathan, had wanted Lino to impress his upper-crust girlfriend. So when Jonathan's long-lost but quick-witted friend Robert shows up, Jonathan convinces him to play Lino. Trouble is, Robert's Italian (limited to pizza menus) and knowledge of plants (they're green) could torpedo this sophomoric plan. Of course, the worst happens! Zany dinner guests soon force the imposter to start running and hiding. You won't stop laughing as everyone looks for the elusive and thoroughly comedic Cousin Lino.