Barnaby Grimes. Return of the Emerald Skull

More about the book

After collecting a strange parcel from a deserted ship in the fog of the docks, and delivering it to the local schoolmaster, Barnaby Grimes thinks he's earned a moment to sit on the rooftops and eat his favourite pasty. But soon he realises that all is not well at the school - but is the problem quite as he expects it?