Our format is unique.  The murder has already happened, no dead bodies to deal with.  I am the Detective and my actors are the suspects.  I provide all of the handout materials "official police information" to your attendees as they are seated in groups at tables.  I come out and make the announcement of what happened, give out the materials and then leave. I return with the "suspects" and call them up to say their testimony.  Then, they are sent from table to table to be interrogated.  We take a short break and return for a brief follow up questioning period.  I collect the solution forms and offer the solution.  We then see which group figured it out. It takes about two hours