Welcome to the Dalton Detective Agency! The Dalton Detective Agency is a goup of art historians that investigate problems in the art world. During this assignment, the agency will embark on a detailed investigation of Leonardo da Vinci and one of his most famous paintings, The Last Supper. Because you are a such a skilled group of students, I am giving you this very important assignment-- Did Leonardo da Vinci really paint The Last Supper? Best of luck on your journey!