International Intelligence Limited
Ex British Intelligence personnel including SAS, carry out investigation services worldwide.
http://www.int-int.co.uk

Detektei Stern
Private Investigator Stern in Frankfurt, Germany. Investigation and surveillance in Europe.
http://www.investigators-germany.de

Oslo Private Investigation
Private Investigation services in Oslo, Norway and rest of Scandinavia. Take on assignments from industry, trade and private clients.
http://www.ope.no/eng/

Morris Chase International
Private and corporate investigators offering surveillance, tracing, forensics, vetting, electronic sweeps and fraud investigations. Based in Heathrow, London.
http://www.morrischase.com

Detective Dingler Stuttgart, Germany: 30 years serving your legitimate interests
The firm headquartered in Stuttgart, Baden-Wurttemberg, provides investigative services to the legal, corporate, financial and Insurance communities, including security consulting.
http://www.detectivedingler.com

PI Magazine
Trade magazine for private investigators, private detectives, and those who want to become a private investigator.
http://www.pimagazine.com

Cramer Investigations
California private investigators that run pre-employment background checks, handle screening and workers compensation; also providing arson investigators.
http://www.cramerinvestigations.com

Powers Security
Private Investigation services to include surveillance, background checks, security cameras, and installation.
http://www.powerssecurity.com