What starts out as a leisurely trail ride turns into a terrifying afternoon when Alex and Leslie see a plume of smoke rising in the trees. After saving the neighbor's horses from a horrible fate, the two teens must run through the burning woods and get back to Green Meadow before it's too late. On the way, they encounter a strange horse wandering through the woods by itself, and it follows them home. Leslie soon becomes attached to "Spark" when she can't find his owner...but will she get to keep him, or will someone come forward to claim the horse she has come to love?