Following the end of World War II, Hollywood produced a series of ‘problem pictures’ that engaged crucial social issues. Lost Boundaries focuses on race—a light-skinned African American couple, unbeknownst to their two children, passes for white in a small New Hampshire town. When their son brings an African-American college friend (played by Greaves) home, the family’s lives are disrupted. Greaves’ first cameo in a Hollywood film convinced him that he could be of greater service to society as a documentary filmmaker; he soon moved to Montreal where he trained at the National Film Board of Canada.