Who Can You Trust?

Raine and her friends start getting anonymous letters telling them all random clues. They eventually find out that they are clues about a girl who went missing years before.
They all get random notes describing the body, how she died, and where her body is. Together the group tries their best to find the girl. They show the police but they just think it is a really messed up prank. With that happening Raine decides they should just find her on their own.
They research the girl for months and finally solve where her body is. But what they find, will change their lives...forever.