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) & 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, & 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.