The article reviews the exhibition "An American in London: Whistler and the Thames," featuring works by the American artist James McNeill Whistler, on view at the Dulwich Picture Gallery from October 6, 2013 to January 12, 2014, at the Addison Gallery of American Art in Andover, Massachusetts from February 1 to April 13, 2014 and at the Freer Gallery of Art in Washington, D.C. from May 2 to August 14, 2014.