Blue Murder at St Trinian's Blue Murder at St Trinian's Blue Murder at St Trinian's (1957) is British comedy film set in the fictional St Trinian's School. Directed by Frank Launder and written by him and Sidney Gilliat, it was the second of the series of four films. and stars Terry-Thomas, George Cole, Joyce Grenfell, Lionel Jeffries and Richard Wattis. The plot is based around a secret marriage agency for the sixth-form girls, that has caught the attention of an Italian prince, based in Rome. The girls break into the Ministry of Education and replace the official (disastrous) school record with a glowing version that
The Mystery of the Blue Train Mirelle, who was on the train with Derek, tells Poirot she saw Derek leave Ruth's compartment around the time the murder would have taken place. Derek is then arrested. Everyone is convinced the case is solved, but Poirot is not sure. He does more investigating and learns more information, talking to his friends and to Katherine, eventually coming to the truth. He asks Van Aldin and Knighton to come with him on the Blue Train to recreate the murder. He tells them that Ada Mason is really Kitty Kidd, a renowned male impersonator and actress. Katherine saw what she thought