Who Killed Harold?

As an introductory lesson to studying History, students analyse a "murder" that had been committed on the school grounds over the school holidays. Students after reading and discussing all the "facts", need to ascertain who killed Harold?
The original sheet had school leaders as the suspects, which the students enjoyed immensely. Students asked to interview the suspects and the school leaders were open to coming in to give an alias. Before interrogating the school leaders, students generated a list of questions to ask, which were then adjusted according to information that the students heard.
After hearing the information and reevaluating the evidence, students were then asked to reassess their original assumption - stating why they had changed their point of view. This was then related to how historians have to change their point of view on an event or period of time according to new evidence that is discovered.