During the Civil War, Union Corporal MacDonald is entrusted with a large shipment of gold. He decides to keep the cargo, and stashes it for later rescue. He is the only one who knows where it's buried, but is killed. A Union Lieutenant and McDonald's two sons race to find out where the gold is buried.

Police Commissioner Verrazzano (Luc Merenda) is visited by charming Giulia Medici (Janet Agren) who claims that her brother, banker Valter Medici didn't commit suicide but was murdered. The investigation leads Verrazzano to dark secrets of loan sharks.

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...

During a thunderstorm, a group of members of London's high society seek refuge in a remote mansion in the countryside. They are received by Uriat and his mother, who appears to be able to communicate with the dead. The guests engage in a séance, but it will reveal each and everyone's darkest secrets.