Porno is a book by Irvine Welsh and is part of the Mark Renton series.
In the last gasp of youth, Simon "Sick Boy" Williamson is back in Edinburgh. He taps into one last great scam: directing and producing a porn film. To make it work, he needs bedfellows: the lovely Nikki Fuller-Smith, a student with ambition, ego, and troubles to rival his own; old pal Mark Renton; and a motley crew that includes the neighborhood's favorite ex-beverage salesman, "Juice" Terry.
In the world of Porno, however, even the cons are conned. Sick Boy and Renton jockey for top dog. The out-of-jail and in-for-revenge Begbie is on the loose. But it's the hapless, drug-addled Spud who may be spreading the most trouble.