Teachers, transform your class into a CSI investigation of one of the most notorious assassinations in history, the spark which started Word War I! In this critical thinking, problem-based learning activity, your students become sleuths, competing in collaborative groups to unravel the murder of the Archduke to determine who is most to blame and to further fuel discussion on the causes of WWI. Even better, students draw parallels to modern-day CSI investigations to make this lesson real-world a