British-born Teresa Simons, recently widowed, returns to England in the hope of coming to terms with her grief. Her husband, and FBI agent, was killed by an out-of-control gunman while on assignment. In an attempt to find some answers, Teresa turns to the virtual-reality world of Extreme Experiences where the best and worst of human experience can be found. Seeking the best, Teresa has to confront the worst. And in the extremes of violence she finds that past and present combine and that her own future may be glimpsed.