Kevin and Robbie find an old helmet with a wing and lose the wing on the way home. An archaeologist from a nearby dig dismisses the helmet as a reproduction of little value, but when Robbie finds the wing it is promptly stolen. Later the thief is caught trying to steal the helmet, but the wing is nowhere to be found.

Black Beauty starts showing unusual behavior and Dr. Gordon suspects rabies. After Beauty attacks two men including the new constable, she is ordered destroyed. But Vicky hides her horse, nothing is as it seems and Black Beauty had a good reason for her behavior.