The 7th Floor (movie, 2013)

Like every day, Marcelo gathers her children on the floor of his ex-wife. As each day play "to see who gets there first" them down the stairs, him in the elevator, a diversion that your ex-partner does not like. But when one day Marcelo plays the downstairs children are not. They are not anywhere. The fear begins to emerge when a phone call will catapult the horror: a kidnapper puts a price for the release of their children