Pedigree: Novelist, playwright and singer-songwriter. Damaged hero: Suicidal Norwegian cop Mia Krüger. Killer’s calling card: Leaves owl feathers by the victim. WTF? It’s to do with black-magic rituals. Creep factor: Medium. This one goes right back to Hitchcock. Sample line: “He took the mouse out of his mouth, locked his dead eyes on to hers and said, ‘I’m the owl.’” Film? Nope, although the slasher StageFright from 1987 featured an owl-masked assailant.