Actress Mignon is the toast of Paris until she marries young American engineer John Stanley. He is commissioned to go to work in the Sahara desert, and Mignon accompanies him with their baby. But it isn't long before she is lonely and horribly bored. When a wealthy Russian, Baron Alexis, passes through the camp, he offers to take her away to Cairo. She goes with him, and he surrounds her in luxury. Years pass, but the situation does not bring her happiness.