Port Allen, Louisiana is a city near Baton Rouge on the Mississippi river. Special Agent Pendergast and Vincent D'Agosta visited during the Fever Dream investigation looking for the residence of a Dr. Arne Torgensson who had treated the artist John James Audubon at a sanatorium over 150 years prior.

Audubon gave Dr. Torgensson a painting known as the Black Frame, which Dr. Torgensson kept with him until the end of his life despite considerable personal and financial troubles. Following a hunch, Pendergast and D'Agosta broke into the basement of his former house, now a store called "Pappy's Donette Hole", and recovered the painting which was hidden in a cavity in the wall.

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