The on-sale date is from the publication date recorded in the Catalog of Copyright Entries, Third Series, Vol. 1, Part 2, Nos. 1&2, Periodicals, 1946-1947.
The Terror Twins [The Black Terror [Bob Benton]; Tim Roland]; Doc Hanley; Snatch Palfrey (villain)
Synopsis
Reports of Bedford Manor being haunted are investigated by members of a psychical research society, but soon discover that it's a clever ruse to kidnap one of its wealthy members.