Matthew Bannon, a poor art student living in New York City, finds a leather bag filled with diamonds during a chaotic attack at Grand Central Station. Plans for a worry-free life with his girlfriend fill his thoughts – until he realises that he is being hunted. Trailing him is the Ghost, the world’s greatest assassin, who has just pulled off his most high-profile hit: killing Walter Zelvas, a top member of the international Diamond Syndicate. There’s only one small problem: the diamonds he was supposed to retrieve from Zelvas are missing. Now, the Ghost is on Bannon’s trail – but so is a rival assassin who would like nothing more than to make the Ghost disappear for ever.