Doctor Burnet, a scholar of ancient history at the British Museum, is obsessed with finding the legendary and priceless Golden Mask of Moloch, believed to be buried in the lost tomb of a Roman general somewhere in the Algerian desert. He plans his latest expedition of discovery, but lacks funds to pay for an archaeologist to accompany him. He learns from the museum curator that Nicholas Chapman, an American author of popular archaeology books, is eager to go along and work without pay, on the understanding that he will be able to publish his experiences in magazine articles and book form. Burnet is dubious of Chapman's expertise and good-faith, but finally agrees to let him join the party. Unknown to them, Burnet and Chapman are accompanied on their flight to Algiers by unscrupulous fortune hunter Petris and his sidekick Kress, who are just as keen to get their hands onthe mask, but in their case purely for financial reasons. On arrival in Algiers, Burnet meets up with his daughter Anne and her boyfriend Jacques, whose father is the curator of the local museum of antiquities. Chapman is attracted to Anne, but she finds his forwardness offputting. That evening, Chapman goes alone to a nightclub, where Kress homes in on him, plies him with drink and introduces him to a sultry belly dancer. After a very enjoyable evening, Chapman returns to his hotel room to find his belongings have been ransacked and his maps stolen. The Burnet party sets out across the Sahara by camel and are beset by dangers including windstorms and attacks by hostile desert nomads. They finally reach the secret tombs, and narrowly escape with their lives when a roof collapses as they excavate. Petris and Kress show up and force Chapman to reveal the location of the tomb. They hatch a plan to kill Burnet and his party to claim the mask for themselves. However Chapman proves to be more than their match and saves the day. With Petris and Kress taken care of, the mask is found safely. Anne realises that she has fallen in love with Chapman, while Jacques magnanimously concedes that they make a good pair. Burnet admits that he was wrong to doubt Chapman's credentials, and sets about transferring the mask safely to London.
Director Jack Lee said the film "was a piece of old hokum, made almost entirely on location. It was quite fun, but it was all cliche stuff, with goodies and baddies and all those spahis riding around chasing bandits."
