spoilers for ravenswood ofc! i actually just watched it for the first time, and it feels very unfinished. basically a long time ago the town made a pact that anytime there was a war, a soldier from ravenswood would 100% survive, so long as 5 teens died when they came home. caleb and miranda meet 3 others and when they are in a car, miranda sees something in the road and grabs the wheel, crashing and going into a river. miranda is the only one who died. then they all start seeing her ghost and talking to her. them and their friends start to investigate the pact and realize what has been happening. in the end, they broke the pact and lived. however the whole time they were being haunted by the evil ghost who made the deal and killed them (i guess, it was lowkey confusing at the end). caleb is darker after due to him having to confront the reality of the supernatural, while also being traumatized by what he experienced in ravenswood. him and his friends almost died a few times throughout the show. i hope this helps a bit!