Sabre-Tooth is the second novel in the Modesty Blaise series, first published in 1966. The story follows Modesty Blaise and Willie Garvin, who are drawn into a dangerous mission when a mercenary army, led by the ruthless Karz, plans to invade oil-rich Kuwait. As Modesty infiltrates the operation, she faces deadly assassins, brutal combat, and high-stakes espionage in the Hindu Kush mountains.