Classic adaptation of H. Rider Haggard's adventure novel, starring Cedric Hardwicke as explorer Allan Quatermaine. When fortune-hunter Patrick O'Brien (Arthur Sinclair) disappears in the African desert after setting off to find the fabled diamond mines of King Solomon, his daughter Kathy (Anna Lee) and native guide Umbopa (Paul Robeson) ask Quatermaine to lead a dangerous expedition into the heart of the country to track him down. There, Quatermaine discovers a secret lost tribe led by an evil witch, and is shocked to find that Umbopa is the heir to the tribe's throne. Only by helping Umbopa regain his position can Quatermaine hope to rescue O'Brien from the tribe's clutches.