Scotland Yard calls Sidney and Nigel to identify a 5th century murder weapon. It turns out to be the burial cross of King Arthur, but besides the victim several others are looking for it, and more killing follows while they search for it in its historical hiding place and unravel the murderous plot.
Did You Know?
Filmed in Chepstow, South Wales See more
Inspector Doyle says that they used a spectrometer to date the age of the murder weapon. Well, spectrometer is usually used in spectroscopic analysis to *identify* materials by measuring properties of light over a specific portion of the electromagnetic spectrum, *not* to determine the material's age. See more