Seven Manipulated Minds

Alfred, an autistic man with genius-level mental abilities, wants revenge because he was treated cruelly back in high school. Now, eight years later, he has developed an almost perfect way to take his revenge against six of his worst tormentors. His device allows him to hijack and transport their minds to a nonexistent room in cyberspace and establish total control over everything they experience. Through a series of vicious torture routines, he manipulates all that they feel, taste, smell, see, and hear to produce the most pain and terror possible. He then forces them to to continuously relive the worst memories of their lives and even abandons them in the ether with no sensory input and no hope of rescue. His punishment brings them to their breaking points. Then, in a totally unexpected action ( at least for his victims), he offers to recruit them into a team, including him to train them to use the methods that he used to torture them to influence the most powerful and public critics of autistic people and change their opinions and actions to become beneficial toward those on the spectrum. 

The group has some success at the beginning but then encounters an enemy so powerful that he threatens the group and its members' lives. Only through reliance on their training, their wits, and each other do they have a chance to survive.