A conversation between the nonfiction writers Keiron Pim and Paul Willetts. They focus on Keiron’s debut biography, “Jumpin’ Jack Flash”, a portrait of David Litvinoff, the East End rebel who formed an improbable link between the Rolling Stones, Lucian Freud, and the Krays. Litvinoff is perhaps best-remembered as the inspiration for the cult 1970 movie, “Performance”, starring Mick Jagger and James Fox.