In 1900 the tomb of Prince Ra is discovered in Egypt by three Egyptologists. The first one, Professor Dubois, is captured by Bedouins and has his hand cut off before they kill him. His daughter and her boyfriend are understandably upset when the tribesmen leave the hand with a knife outside their tent, as a warning to go away.
Sir Giles wants to sell the mummy of Ra to the Cairo Museum but the financial backer of the dig, Mr. King, wants to take the mummy on the road. Their camp is broken into. Then on the ship to London, Giles is attacked. In a flashback we learn how Ra was befriended by a tribe of nomads was bestowed a pendant that had the secret of life. But the prince is betrayed and they cut off his left hand, proof that they killed him.
Once in London, the mummy comes to life and begins killing people. And the French daughter of Professor Dubois becomes involved with a mysterious man, who has something to do with the mummy coming to life.
This is a decent mummy movie from Hammer, though it doesn't quite have the same charm as the Universal Mummy series.