A desperate message in a bottle, written in blood by a boy being held captive, is received eight years after it was sent. It leads renegade cold case detectives Carl Mørck (Nikolaj Lie Kaas) and Assad (Fares Fares) to a shadowy religious community connected with a string of missing and murdered children-including two whose lives hang in the balance. The latest film in the gripping Department Q series-which have shattered box office records abroad-is another taut, tightly crafted whodunit steeped in chilling Gothic atmosphere.