The riders of Bright Fields Stables are playing a game of Truth or Dare - or rather, Truth or Mare, since the horses are involved, too! All of the riders' fun dares end up on Becky's vlog, which she hopes will make it big. Meanwhile, there's a ghost dog that might be running around Pin's castle - and a treasure to be found. Lots is happening ... but above all, Zoe is beginning to question, is the island where she's supposed to be?