The Spirit of Satan. Crescendo is directed by Alan Gibson and written by Alfred Shaughnessy and Jimmy Sangster. It stars Stefanie Powers, James Olson, Margaretta Scott, Jane Lapotaire and Joss Ackland. Music is by Malcolm Williamson and cinematography by Paul Beeson. Susan Roberts (Powers) travels to the South of France to stay with the Ryman family as she researches the work of late composer Henry Ryman for her thesis. Once there at the villa, Susan finds that the remaining family members are a little strange… Out of Hammer Films, Crescendo came at the end of the studio’s cycle of psy...