through the thick and thins

Alyssa and Sara are best friends from birth practically, they've been through a lot together. 12 years worth. Sara is the more courageous one and Alyssa is more conservative and keep to herself. These days, at 17 years old the pair are like a mother and daughter couple, especially at parties. Alyssa takes care of Sara all night long and Sara suffers from a hangover on Alyssa's couch. Can one fateful game of truth or dare that made their roles switch be the reason why the meaning of going Through The Thick And Thins with someone was redefined? Or could it actually be fate that brought that strange blue eyed country stranger in the blue pickup truck to terrorize the girls shifting their lives from normal to a living hell? Or could it just be someone from their past being the puppet master, using the stranger as a puppet to see them suffer?