Cryer's Cross by Lisa McMann

The small town of Cryer's Cross has the traumatic experience of one of their teenagers going missing. As if that wasn't bad enough, a few months later another teen goes missing. This time it is Kendall's boyfriend, Nico. While neither bodies can be found, Kendall struggles to cope with the loss of Nico and searches for an explanation. Soon enough Kendall finds herself in a similar situation as the missing teens and finds out exactly where they went.

A chilling tale with a total twist ending. I loved it. I wish it were a series :p