The propaganda videos of ISIS fighters are nothing new. On the contrary, terrorists have always used images to spread their messages through the media – just as their enemy, the state, has done. In her study 'Terror. When Images Become Weapons,' Charlotte Klonk explores the role that images of terror have played from the 19th century to our immediate present. Through concrete case studies and with a trained eye for art history, she analyzes the image strategies, places them within their historical development, and ultimately addresses the pressing question of the ethical handling of images of terror. An indispensable book for understanding the background of the pervasive phenomenon of terrorism.