Blue Murder at St Trinian's is a 1957 British comedy film, directed by Frank Launder, co-written by Launder and Sidney Gilliat, and starring Terry-Thomas, George Cole, Joyce Grenfell, Lionel Jeffries and Richard Wattis; the film also includes a brief cameo of Alastair Sim, who reprising his lead role in the 1954 film, The Belles of St. Trinian's. Inspired by the St Trinian's School comic strips by British cartoonist Ronald Searle, the film is the second entry in the St. Trinian's film series, with its plot seeing the students of the fictional school making plans to secure a place on a European tour, all while subsequently aiding a criminal who is secretly seeking to escape the country with stolen jewels. The film received generally positive reviews from critics, with praise given to the evolution of the comedy following the first film. It was later succeeded by a sequel, The Pure Hell of St Trinian's, in 1960. Plot At St. Trinian's, the students run wild with headmistress Amelia Fritton and its teachers gone, prompting the Ministry of Education to keep them under control with help from the army. In the meantime, the school's business associate Flash Harry sets up a marriage bureau for the sixth form girls, hoping to marry one of them to Prince Bruno. As the prince will only make a decision if the girls are brought to him before July, Harry decides to take advantage of a UNESCO offer to the British government, which will provide an expenses paid tour of various European cities that will end in Rome. To ensure the school is picked, some of the sixth form students break into the Ministry and replace their file, containing negative feedback from inspectors, with one that casts the school in a positive light. Shortly after the break-in, Harry and the students discover that the Ministry is sending in a new headmistress recruited from Australia, Dame Maud Hackshaw, who they suspect will withdraw their nomination. On the night she is due to arrive, Harry is surprised when one of the sixth form girls, Myrna Mangan, reveals that her father Joe has turned up needing help. Discovering that the local police are searching for him, under orders by Superintendent Kemp-Bird, Harry and Myrna decide to disguise him as Hackshaw, with the students abducting the real Hackshaw and imprisoning her in the school. In the meantime, a forged letter from Hackshaw