W. Leslie Curnow, a spiritualist, contributed much research to the book.[95][96] Later that year, Robert John Tillyard wrote a predominantly supportive review of it in the journal Nature.[97] This review provoked controversy: Several other critics, notably A. A. Campbell Swinton, pointed out the evidence of fraud in mediumship, as well as Doyle's non-scientific approach to the subject.[98][99][100] In 1927, Doyle gave a filmed interview, in which he spoke about Sherlock Holmes and spiritualism.[101]