The Caravan: Abdallah Azzam and the Rise of Global Jihad. By Thomas Hegghammer. New York: Cambridge University Press, 2020. 718p. $34.99 cloth. - Your Sons Are at Your Service: Tunisia’s Missionaries of Jihad. By Aaron Y. Zelin. New York: Columbia University Press, 2020. 400p. $120.00 cloth, $40.00 paper, - Unmasking Boko Haram: Exploring Global Jihad in Nigeria. By Jacob Zenn. Boulder: Lynne Rienner, 2020. 415p. $95.00 cloth.