The Night House (1970)

Recently orphaned, Richard has been sent to live with relatives in the remote US town of Ballantyne. One day, during an innocent prank in a phone booth, Richard shockingly witnesses his classmate getting sucked into the phone receiver – disappearing without a trace. The local police suspect Richard to be responsible, and no one believes his story. No one except Karen, a fellow teenage outsider. Together, Richard and Karen must embark on a quest to solve the mystery and prove his innocence, but soon realise evil forces and black magic are closing in on them.