“Certainly, de Grandin was not the first occult detective – Algernon Blackwood’s John Silence, Hodgson’s Thomas Carnacki, and Sax Rohmer’s Moris Klaw preceded him – nor was he the last, as Wellman’s John Thunstone, Margery Lawrence’s Miles Pennoyer, and Joseph Payne Brennan’s Lucius Leffing all either overlapped with the end of de Grandin’s run or followed him.”

“Certainly, de Grandin was not the first occult detective – Algernon Blackwood’s John Silence, Hodgson’s Thomas Carnacki, and Sax Rohmer’s Moris Klaw preceded him – nor was he the last, as Wellman’s John Thunstone, Margery Lawrence’s Miles Pennoyer, and Joseph Payne Brennan’s Lucius Leffing all either overlapped with the end of de Grandin’s run or followed him.”

— Seabury Quinn