Cullys upcoming wedding with the concert manager Simon is putting the Barnabys in an uproar. Meanwhile, on the boisterous wedding party by Ned Fitzroy, the 4th Earl of Bledlow, the bridesmaid Marina gets impaled to the wall paneling with an antique family-dagger. The aristocracy celebrates unmoved further, as two more persons are murdered in the castle. Not in any investigation have Barnaby and Jones been met with as much contempt as by the Fitzroys. And Barnaby never had to escape a deadly arrow.