Michael Caine described this as "the worst, most wretched film I ever made", but, in reality, it's not that bad.
Michael Caine is a UN doctor, working in aid camps in Africa alongside his wife (Beverly Johnson), also a UN doctor, who is from the Ashanti tribe. While swimming in a lake near the aid camp, she is kidnapped by slave traders, led by Suleiman (Peter Ustinov). He is sure that, being an Ashanti and beautiful, he will get a high price for her from his best customer, wealthy Arab price Omar Sharif.
Caine sets off to find her, helped along the way by a British anti-slave campaigner (Rex Harrison), an American mercenary (William Holden) and an enigmatic Arabian nomad (Kabir Bedi).
Truly all-star, then, and not entirely unenjoyable. Not exactly taxing for either the audience or Caine, who does well as the grief-stricken but persistent husband, while Ustinov provides a comic turn as the slimy slave trader.
Camp, as only late 70s action movies can be, this is mindless but entertaining fun.