Mrs Casson

In the short story The Voice in the Dark, Mrs Casson is a spiritualist and a contact of Roley Vavasour, a cousin of Lady Stranleigh's daughter Margery Gale. Ever since Margery reported hearing "voices in the dark", Mrs Casson had been pestering Margery to hold a seance with a qualified medium. This was eventually done when Roley and Mrs Casson brought a medium Mrs Lloyd to Abbot's Mede, and more or less thrust a seance on Margery.