Andrew's family and his aunt and cousin all drive up to a cabin in the woods to camp. It is fairly dark outside when they arrive because Duffy forgot his suitcase.
They go into a bedroom the next morning and find a creepy message in the wall. Saying beware of the Sentinel! The kids get scared of the message and wonder what the message is about.
Beware of the Sentinel!
After they eat they decide to go out on another walk in the woods. They took off their jackets while they were walking. Duffy forgot his coat on a log though.
Their moms decide to go into town to get supplies. The kids are left at home and they play board games when the hear a scratching on the door. They see the scary creature and run outside to get away from
They run outside to the barn to see if the can hide in it but they find it locked. They can't go anywhere else so they go back inside.
They go back inside but then realize it is coming back. The Sentinel bursts through the door and comes and returns Duffy's jacket and leaves.