“I think Jane Austen, in general, writes about young people and young love very accurately,” says Leo Suter, who costars with Theo James and Rose Williams in the PBS Masterpiece adaptation of Jane Austen’s final unfinished novel, Sanditon, written and executive produced by Andrew Davies. Originally titled The Brothers, the manuscript was left unfinished in 1817 with only the first eleven chapters written, and has since been adapted and completed in various versions.