Traces of the Trade: A Story From the Deep North

The 21st-season opener features "Traces of the Trade: A Story From the Deep North," an exploration of filmmaker Katrina Brown's slave-trading ancestors, the Rhode Island DeWolfs. She and nine relatives (including Tom DeWolf, author of "Inheriting the Trade") retrace the old slave-trading route, including stops in Bristol, R.I., Ghana and Cuba.