A gang of sophisticated criminals, led by the notorious 'Nervous' O'Dell, operate under the guise of a respectable flower-arranging club. Their meticulously planned robberies are constantly thwarted by a determined police inspector who suspects their true activities. When a rival gang of undertakers threatens to muscle in on their territory, O'Dell must use his wits and his unconventional network to protect his operation and expose the newcomers.

The Wrong Arm of the Law was a moderate success, appreciated for its lighthearted take on crime capers and Peter Sellers's comedic performance. While not universally lauded as a classic, it is remembered fondly as a charming British crime comedy with a clever premise and a strong ensemble cast.

• Praised for its witty script and inventive plot.
• Appreciated Peter Sellers's characteristic comedic timing.
• Seen as a solid, if not groundbreaking, example of British crime comedy.

Google audience: Audience reviews are generally positive, highlighting the film's humor and the memorable performances, particularly Peter Sellers. Many find it an enjoyable and lighthearted crime comedy from its era.

The film features a rare early role for Burt Kwouk, who would later become famous for his portrayal of Cato Fong in Blake Edwards's 'The Pink Panther' film series, often opposite Peter Sellers.