Project X Presents: Ghosts At The Grange - a murder mystery

Arthur lives alone at The Grange and when he is murdered, there are no witnesses, or are there? No one can see them and no one can hear them because Lancelot and Guinevere have been dead for over a hundred years. They see the murder take place but how can they let Arthur's family know who committed the dreadful deed?Why does the sword fall off the wall?
Who ate all the pink French Fancies?
What are toys from the old nursery doing on the floor?
And more importantly
Does anyone know a medium?