WHO4 - The Ultimatum

The world economy has collapsed. A secret evil organisation called Decennial is behind it which aims to destabilize the world economy and trigger a global recession. It has operatives in the biggest economies in the world. William Smith, the main antogonist, is the Decennial operative in India. CID Officer Puneet Sahani is assigned this case in India. Puneet's best friend and colleague Maddy finds out that Puneet himself was involved in the evil activities performed by William and who earlier believed that William was dead but is actually living in disguise in London, he takes it to the higher authorities but only to learn that Puneet is on a secret mission to track down the entire group through befriending William.

Puneet arrives in London where the suspected chief of Decennial resides and learns that William has accepted a new secret task from the chief himself - to kill his enemies. William being a Science prodigy, uses a telepathic mind control drug to carry out his killings. Eventually Puneet himself is the target and even Maddy's life is at stake. Puneet joins hands with the MI6 and Maddy to track down William and the entire Decennial gang in this epic thriller and grand finale to the 4-film series.