Norman Porter, a convicted double murderer from Massachusetts, served 25 years in prison before escaping to Chicago where he spent the next two decades living under the name JJ Jameson. He was apprehended in 2005, thanks to a relentless police investigation, just after being named Chicago’s “Poet of the Month.” The film interweaves varying perspectives on an elusive and enigmatic persona, from the eccentric characters living in the heart of Chicago’s beatnik-artist community, to the victims’ embittered families in Boston, and the vigilant officers behind the 20-year hunt for a killer.

• Documentary