Ida Tarbell begins to investigate Standard Oil. And as she digs deeper, she receives help from some unexpected sources. Soon, John D. Rockefeller learns that his deepest secrets could come spilling out into the light.Listen ad-free on Wondery+ hereSupport us by supporting our sponsors!See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.