By Robert Thorogood. Paul is young, rich and in love. So why does he lock himself in the library and refuse to open the door to anyone? But he cannot lock everyone out, and his strange and disconcerting nocturnal visitors help him to make the most important decision of his life. Paul Wolfskehl ......Daniel Evans Stefan ...... Andrew Mayer Infinity ...... Emma Fielding Clara/Johanna ...... Francesca Dymond Otto/Joseph ...... Steven McNicol Fermat ...... Roger Allam Friedrich (Doctor) ...... Sam Parks Directed by Ellen Dryden.