An unauthorised reprise of Hitchcock's Vertigo. The film is based on the same plot with some alterations, most significantly the detective is prone to a heart attack instead of vertigo.
Liang Tien and Chang Ying are in competition, teaching people lessons, but when the going gets tough, they join forces, eventually leading to hilarious climax in a brothel.
Ducky is hired by Rich Chen to transport the "diamonds" he stole from Uncle Pai Mary. Uncles Tough Guy and Mary would like to get the diamond from Ducky, so they volunteer to relieve Ducky of his responsibility.