An average boy

This story is a thriller, drama. It's about a normal boy called Hunter who was raised by both his parents.He just turned 14 in the beginning and he doesn't feel too close to his parents. One day, coming home from school he finds a message written on paper at his front door. "Come and find us ;)" he thinks his parents are throwing a birthday party for him. He walks in only to find something that's unexpected. How he handles this situation as time passes is rather odd.