Kabir Khan's upcoming film that stars Saif Ali Khan and Katrina Kaif in lead roles, avoided borrowing its name from its source material - writer S Hussain Zaidi's novel Mumbai Avengers - because the filmmaker wanted a more cinematic title that describes its lead character better. “Post 26/11, India was seething with rage. And yet, they were unable to take revenge because of the widespread terrorist network. The film takes on from there and tells the story of how RAW brings on board a man without a past or future, best described as 'Phantom'. They find a disgraced army officer, who was thrown out for cowardice, to lead the mission. Somewhere, the spectre identity was best encapsulated in this title, which became the unanimous choice,“ says our source.