Synopsis: In a moment of cowardice, Detective Carl Mørck sends Rose, his junior colleague in Department Q, to the remote Danish island of Bornholm to answer his old colleague Christian Habersaat's repeated requests. But during his forced retirement ceremony Christian kills himself sending Rose into a journey deep into her own traumatic past. Later, the newly engaged Carl arrives on the island where he, Rose and Assad are embroiled into an old cold case of a girl found dead hanging in a tree.