The Puppet Master

Jack is thought to have murdered his sister and her boyfriend when he was fourteen and his parents were out for a meal. Jack says it was the man in his dreams who did it and he could only watch in his dream.
The man in his dreams says he is from a place like hell and he is going to come back through Jack to wreak havoc upon the mortal world.

Thanks akwardweirdo for the cover design. She also writes books so check her out.