When the famous Pink Panther diamond is stolen again from Lugash, Chief Inspector Clouseau (Peter Sellers) is called on the case despite protests by Chief Inspector Dreyfus (Herbert Lom). While on the case, Clouseau is pursued by the Mafia. Clouseau first goes to London to interrogate Sir Charles Litton (having forgotten that he lives in the South of France). Traveling to the airport, he accidentally blows up his car trying to fix a pop-out lighter, but mistakenly believes it an assassination attempt, and disguises himself in a heavy cast on the flight, which causes complications in the air and on land. He then is led to an awkward introduction to the Scotland Yard detectives at Heathrow. Meanwhile, Dreyfus learns from Scotland Yard that Libyan terrorists have marked Clouseau for assassination; but permits him to continue. Heretofore at the hotel, Clouseau has a miscommunication with the hotel clerk (Harold Berens) and gets knocked out a window several times (even pulling the clerk right through the wall a la switchboard), trying to get his "message" from Dreyfus.