Rat-pack pals Sammy Davis Jr. and Peter Lawford reprise their roles of Charlie Salt and Chris Pepper, respectively, in this film that marks the directorial debut of comedian/writer Jerry Lewis. Lawford also plays Lord Sydney Pepper, the twin brother of Charlie who is a murder victim. Salt and Pepper investigate the crime in this uneven comedy feature. Pepper takes the place of his dead brother and winds up involved in a diamond-smuggling operation. The duo is chased through the bucolic English countryside by Interpol agents and crooks after the stolen gems. Like many sequels, it fails to be as amusing as the original, which wasn't that great in the first place.
by Dan Pavlides synopsis