How many causal paths lead to suicide terrorism? Unfortunately, too many to produce precise predictions about when and where suicide terrorism is likely to occur. Nonetheless, Mia Bloom's, Diego Gambetta's, and Robert Pape's books do an excellent job of addressing this phenomenon with sophisticated theories and empirical findings. While Pape presents a coherent, single theoretical framework for explaining suicide terrorism, Bloom and the contributors in Gambetta's book focus on a range of loosely interconnected causal explanations across individual, organizational, and societal levels. These works also have a rich historical and comparative focus across time and cases. Even so, the fundamental question is how they advance our knowledge about suicide terrorism.Karen Rasler is professor of political science at Indiana University, Bloomington.