 The Secret of Boyne Castle (television title) or Guns in the Heather (theatrical title) is a wild romp through late 1960 s Ireland with two school chums being pursued by spies from an unknown state. After having escaped from the "bad guys," (see description in episode #1) Rich Evans and his friend Sean O Connor are pursued cross-country by the spies who captured them, with the Irish countryside and highway system as a backdrop. While in captivity the two school chums noticed that one of their captors wore a peculiar looking ring. This ring more than once gives away the head spy while Evans and O Connor continue on their journey to Boyne Castle. All the while Rich is wondering what his brother Tom s involvement in all this is. The "secret" of course lies at Boyne Castle.