The Colour of Money

From the introduction: An undocumented Merovingian coin has been listed for sale on eBay near Southend. It doesn't look it, but it must be fake? The coin has been disinterred by Sutton - a revenant sorcerer, once founder of the Providence Baptist Church in Prittlewell, who continues its mission to tempt out the entity sealed in an Anglo-Saxon tomb. Sutton will succeed the evening after the scenario begins.