A woman is strangled in the bath by a black-gloved killer who disposes of her body in a large trunk. The trunk is delivered to St. Hilda College, an exclusive finishing school. Betty-Anne, one of the female students, is strangled in the school cellar. The police, led by Inspector Durand, are called in to investigate. Suspects include La Floret, the voyeuristic gardener; Di Brazzi, the new swimming instructor; Mrs. Clay, the summer school French mistress; an old professor who collects birds; and a philandering young teacher called Richard. The murders continue but Jill, a keen amateur detective, helps the police identify the unlikely killer...
Mark Damon
as Richard Barrett
Eleonora Brown
as Lucille Moffat
Sally Smith
as Jill
Patrizia Valturri
as Denise
Ludmila Lvova
as Mrs. Clay / Peter Moffat
Luciano Pigozzi
as La Foret
Franco De Rosa
as Detective Gabon
Vivian Stapleton
as Miss Transfield
Ester Masing
as Miss Martin
Aldo De Carellis
as Professor André
Giovanni Di Benedetto
as Di Brazzi
Valentino Macchi
as Policeman
