Salah Abdeslam decided not to die with his brother Ibrahim in November's terrorist attacks in Paris. Why he did not go through with his alleged mission as one of the suicide bombers involved in the operation, we do not know. We know only that 10 days after the attacks, an explosives vest was found in a Paris suburb, some distance from the targeted sites, where Abdeslam's cell phone showed him to have been shortly after the attacks. His survival, and now his capture, may provide authorities with a window into the Islamic State's terrorist network in Europe.