Blackthorne Institute is a top secret school for spies and assassins. Dr. Steve Sanders was a teacher there. The first mention of the school was when Cammie found a picture of Mr. Solomon, who was wearing a Blackthorne t-shirt, with her father when they were young. In OGSY, Zach told Cammie - in the caves underneath Blackthorne, that they don't use any assassin tactics anymore. That the 'curriculum' has been changing thanks to Joe Solomon.