Graham died in 1965 of an undiagnosed brain tumour, aged 52. Her illness and death resulted in the cancellation of a planned sequel to "Dear Enemies". Both "Swiss Sonata" and "Earth and High Heaven" were reissued by Cormorant Books in 2004. Graham is the subject of a biography "Gwethalyn Graham: a Liberated Woman in a Conventional Age" by Barbara Meadowcroft (Toronto: Women's Press, 2008).