Opening sequence synopsis

Background
Before the film starts, someone has gone missing and an investigation is taking place.
They have been kidnapped by a person or group of people who are looking for something, believing the victim to have it or know its whereabouts.

Synopsis
Two detectives are investigating the missing persons case. Following a lead, they end up at a house. They find signs of a struggle, and an identifiable piece of clothing [necklace or something similar].
At this point there is a black and white flashback showing the attack, leaving the house in the state the detectives found it.
The film then cuts back to the present, the detectives are putting the identifiable piece of clothing [necklace or something similar] into an evidence bag and leave to take back for analysis.
Then cuts to another house, or building, where we see the inside of a very dark room a door opens from a lit room, allowing us to see a silhouetted character [implied to be the attacker]. The light also allows to see the victim tied to a chair in an otherwise empty room.