A renegade sheik named Ali Higg, known as the "Lion of Petra," has become a danger to British interests in Palestine. Jimgrim is an American secret agent working for British Intelligence who seeks to undermine Ali Higg's plans to raid British controlled territory and win him as an ally instead. He is joined by his compatriots Jeff Ramsden and Narayan Sing, a Sikh, who is very dangerous warrior.