Lets just say Duffy is not the smartest and that is bad because there parents want them to go camping because there moms red somewhere that if you don't do manly stuff with your kids they will turn weird so when they show up to the house and it is really far away from everything in the middle of the woods Andrew is not exited.
When they were cleaning the house Andrew find a note that says beware of the sentinel so he is already scared but then when he goes on a walk Duffy loses his jacket and now Andrew think he is being followed by the sentinel.
dang it Duffy
When the moms leave the kids home alone because they are going shopping for supply's they hear scraping on the door so Duffy go's and check and they realized it was this huge monster out the door so they decided to run out the back door to the barn.
When they get to the barn they see that the sentinel has gotten in the house and now went out the back door looking for them. SO when they are trying to get in the barn they see that it is lock by a padlock so they decided to run back in the house.
When they run in the house they run up stairs and go to the bedroom then the sentinel walks in then hand back Duffy jacket.
here is your jacket stupid
Duffy after that terrifying monster that he witnessed he never forgot anything again.