Seeking revenge, John knocks out the power to the building and begins tearing the office to pieces.

Devil May Call was financed by Urs Brunner, the CEO of Boncafe and Angel and Bear Productions.

The production also consulted with crisis hotlines to authenticate the calling process for volunteers and how the centers are managed.

The office location where most of the action takes place was in a practically abandoned building which helped sell the isolation and general creepiness of the story.

A nighttime schedule also allowed the production to work without disturbing the few residents still left in the entire building.