Dead Men Don't Wear Plaid

As the private eye of private eyes, Steve Martin is Rigby Reardon. He's tough, rough and ready to take on anything when Juliet Forrest appears on the scene with a case: her father, a noted scientist, philanthropist and chesemaker, has died mysteriously. Reardon immediately smells a rat and follows a complex maze of clues that lead him to the "Carlotta Lists." With a little help from his "friends" Reardon gets his man. (official distributor synopsis)