Bon Anniversaire'

Nathan Flynn, now turning the 15 gets an ATV for his birthday. He's quickly off to show to his good friend Victor. Victor loves what Nathan got for his birthday but he thinks that he has a better present for Nathan. They both go into the forest at the back of their neighborhood to test out the ATV but while in there they see many weird things and talk to strange creatures but how is it possible? Aren't these things make believe or is the forest some sort of teleportation device into another dimension.