Ten years on from . Trainspotting, . Simon . Sick . Boy . Williamson is back in . Edinburgh after a long spell in . London. . Having failed spectacularly as a hustler, pimp, husband, father and businessman, . Sick . Boy taps into an opportunity, which to him represents one last throw of the dice. . However, to realise his dream of directing and producing a pornographic movie, . Sick . Boy must team up with old pal and fellow exile . Mark . Renton and a motley crew that includes the citys favourite ex-aerated-water-salesman, . Juice . Terry . Lawson. In the world of . Porno, however, nothing is straightforward, as . Sick . Boy and . Renton find out that they have unresolved issues to address, concerning the increasingly unhinged . Frank . Begbie, the troubled, drug-addled . Spud, but, most of all, with each other.