Blackthorne Detective Agency is a full service, private investigator agency providing services to attorneys, corporations, small businesses, and the general public. Blackthorne Detective Agency is a Washington State Licensed Private investigator company with a global reach. All investigations are conducted by highly trained, experienced and Washington licensed private investigators.


Blackthorne private investigators guarantee the same diligence in its approach to all work in order to achieve results for our clients. We specialize in surveillance for infidelity investigations, child custody, and workers compensation, Undercover investigations, Missing persons, Executive protection, Legal process service.

Our goals are to present you with a complete investigation, detailed, accurate, and on time. We are confidential, discreet, and always committed to maintaining the highest investigative standards. We supply our clients with daily updates, reports, and other critical information relative to the case.

Blackthorne Detective Agency private investigators will work with you to find the best approach for your unique investigation. The private investigator assigned to your case will honestly determine if we can effectively support your needs before we take the case. If we are not a good fit for your goals we will help find you a suitable private investigator absolutely free.

Our pricing is competitive and flexible to suit all budgets and needs. If you feel we can be of assistance to you, please contact us. The Blackthorne team of private investigators looks forward to helping you.

Call Now for a free Consultation

206-793-2126

Blackthorne Detective Agency
15 Oregon Ave.
Tacoma, WA 98409
206-793-2126

Blackthorne Detective Agency
3614 152nd St. NE
Marysville, WA 98271
206-793-2126

Private Investigation Agency license# #1754