ISBN-13: 9781548738136 / Angielski / Miękka / 2017 / 196 str.
ISBN-13: 9781548738136 / Angielski / Miękka / 2017 / 196 str.
Detective stories in which the great Thomas Carnacki investigates the supernatural using scientific tools, such as photography, and tools that are augmented by theories of the supernatural, such as the electric pentacle, which uses vacuum tubes to repel supernatural forces.