Walks a wobbly fine line. TWITTER Sofia Kappel stars as a young Swedish woman keen to break into the adult film industry in L.A. in Ninja Thyberg's feature debut. A young woman arrives from a distant land in the capital of a certain entertainment industry and ascends the ladder of success, only to lose a bit of her soul on each rung of the climb. That, of course, is the plot of Showgirls, but it's not like Paul Verhoeven, or anyone who's written a version of Faust, ever patented the concept. This means Swedish writer-director Ninja Thyberg has room to put her own stamp on this classic rags-to-riches-to-nihilism-and-disillusion narrative arc with