 In their book "Ghosts of Borley" (1973), Underwood and Paul Tabori wrote that they believed "some of the phenomena were genuine" at the Borley Rectory.The researcher Trevor H. Hall criticized Tabori and Underwood for selective reporting.According to Hall, the alleged paranormal phenomena from the rectory were the result of natural causes, such as noises produced by rats or flying bats, pranks by local village boys throwing stones at the house, or tramps trying to keep warm by lighting small fires in the rectory.