The Black Chamber is the American cryptanalysis agency, which was officially disbanded in 1929, then secretly re-tasked with occult intelligence duties. The Black Chamber is the US equivalent of The Laundry.
However, the Black Chamber is portrayed as much more sinister and secretive than the Laundry, as the nature of their operations are rarely known in detail. The name "Black Chamber" itself is the designation the Laundry had given to the organization: its internal name is Operational Phenomenology Agency (OPA). They are also called the Nazgûl in reference to the black riders from Tolkien.
They are first mentioned by Bob Howard in The Atrocity Archives as experimenting with industrial-grade lasers to power summoning circles - rather than old-fashioned electricity as is still the case in the UK.
- ↑ p24, The Atrocity Archives, Orbit, 2011