Tristam Gowers and Yves Lafeu have the flamboyance of stage matinee idols, but currently they are running a very smart restaurant, Tryst, which is much patronized by top people in the theatrical profession. Which means it's not Charles Paris's usual ambience, but this small-part player, who's more successful as an amateur detective than as professional actor, is the guest tonight of another fascinating duo, William Bartlemas and Kevin O'Rourke, wealthy collectors of theatrical memorabilia. And he is in at the death: the gruesome murder of Yves.