Spoons of the Misbegotten

Rare gem and goose are both pursued...

...old boy drops hints, some very rude:

     "The Blue Carbuncle" / the "clue-barb" uncle

Another Doyle tale...? Ain't no way...

...my burro's busses make me bray: 
     "The Case of the Missing Fuel" / the face of the kissing mule