Clue idea for story

Plot: A group of people have been invited to the reading of a will.
However during the reading of the will a murder is commited. Which
leaves the rest of the people trying to figure out who the murderer
is. A part of the will requires that the guest spend the night in the
house and the will be read in the morning. Now everyone must spend the
night to hear the will and survive.
Interactive: each person in the story will have to interact with each
other to figure out who the murderer is and to help continue the plot.